diff --git a/src/gui/src/MainWindow.cpp b/src/gui/src/MainWindow.cpp
index ccb5c196..55052efe 100644
--- a/src/gui/src/MainWindow.cpp
+++ b/src/gui/src/MainWindow.cpp
@@ -442,7 +442,7 @@ void MainWindow::checkFingerprint(const QString& line)
         barrier::string::from_hex(fingerprintRegex.cap(2).toStdString())
     };
 
-    auto db_path = DataDirectories::trusted_servers_ssl_fingerprints_path();
+    auto db_path = barrier::DataDirectories::trusted_servers_ssl_fingerprints_path();
 
     // We compare only SHA256 fingerprints, but show both SHA1 and SHA256 so that the users can
     // still verify fingerprints on old Barrier servers. This way the only time when we are exposed
@@ -564,7 +564,7 @@ void MainWindow::startBarrier()
     // launched the process (e.g. when launched with elevation). setting the
     // profile dir on launch ensures it uses the same profile dir is used
     // no matter how its relaunched.
-    args << "--profile-dir" << QString::fromStdString("\"" + DataDirectories::profile() + "\"");
+    args << "--profile-dir" << QString::fromStdString("\"" + barrier::DataDirectories::profile() + "\"");
 #endif
 
     if ((barrierType() == barrierClient && !clientArgs(args, app))
@@ -1020,7 +1020,7 @@ void MainWindow::updateSSLFingerprint()
         return;
     }
 
-    auto local_path = DataDirectories::local_ssl_fingerprints_path();
+    auto local_path = barrier::DataDirectories::local_ssl_fingerprints_path();
     if (!QFile::exists(QString::fromStdString(local_path))) {
         return;
     }
diff --git a/src/gui/src/SslCertificate.cpp b/src/gui/src/SslCertificate.cpp
index 57fb5f1b..910e0a8d 100644
--- a/src/gui/src/SslCertificate.cpp
+++ b/src/gui/src/SslCertificate.cpp
@@ -38,7 +38,7 @@ static const char kSslDir[] = "SSL";
 SslCertificate::SslCertificate(QObject *parent) :
     QObject(parent)
 {
-    m_ProfileDir = DataDirectories::profile();
+    m_ProfileDir = barrier::DataDirectories::profile();
     if (m_ProfileDir.empty()) {
         emit error(tr("Failed to get profile directory."));
     }
@@ -73,7 +73,7 @@ void SslCertificate::generateCertificate()
 void SslCertificate::generateFingerprint(const std::string& cert_path)
 {
     try {
-        auto local_path = DataDirectories::local_ssl_fingerprints_path();
+        auto local_path = barrier::DataDirectories::local_ssl_fingerprints_path();
         barrier::FingerprintDatabase db;
         db.add_trusted(barrier::get_pem_file_cert_fingerprint(cert_path,
                                                               barrier::FingerprintType::SHA1));
diff --git a/src/lib/barrier/App.cpp b/src/lib/barrier/App.cpp
index dd0e6197..9216470a 100644
--- a/src/lib/barrier/App.cpp
+++ b/src/lib/barrier/App.cpp
@@ -164,7 +164,7 @@ App::initApp(int argc, const char** argv)
     // parse command line
     parseArgs(argc, argv);
 
-    DataDirectories::profile(argsBase().m_profileDirectory.u8string());
+    barrier::DataDirectories::profile(argsBase().m_profileDirectory.u8string());
 
     // set log filter
     if (!CLOG->setFilter(argsBase().m_logFilter)) {
diff --git a/src/lib/barrier/ServerApp.cpp b/src/lib/barrier/ServerApp.cpp
index 3ecfd912..d11f960e 100644
--- a/src/lib/barrier/ServerApp.cpp
+++ b/src/lib/barrier/ServerApp.cpp
@@ -130,11 +130,11 @@ ServerApp::help()
     // refer to custom profile directory even if not saved yet
     barrier::fs::path profile_path = argsBase().m_profileDirectory;
     if (profile_path.empty()) {
-        profile_path = barrier::fs::u8path(DataDirectories::profile());
+        profile_path = barrier::fs::u8path(barrier::DataDirectories::profile());
     }
 
     auto usr_config_path = (profile_path / barrier::fs::u8path(USR_CONFIG_NAME)).u8string();
-    auto sys_config_path = (barrier::fs::u8path(DataDirectories::systemconfig()) /
+    auto sys_config_path = (barrier::fs::u8path(barrier::DataDirectories::systemconfig()) /
                             barrier::fs::u8path(SYS_CONFIG_NAME)).u8string();
 
     std::ostringstream buffer;
@@ -197,7 +197,7 @@ ServerApp::loadConfig()
 
     // load the default configuration if no explicit file given
     else {
-        auto path = barrier::fs::u8path(DataDirectories::profile());
+        auto path = barrier::fs::u8path(barrier::DataDirectories::profile());
         if (!path.empty()) {
             // complete path
             path /= barrier::fs::u8path(USR_CONFIG_NAME);
@@ -210,7 +210,7 @@ ServerApp::loadConfig()
         }
         if (!loaded) {
             // try the system-wide config file
-            path = barrier::fs::u8path(DataDirectories::systemconfig());
+            path = barrier::fs::u8path(barrier::DataDirectories::systemconfig());
             if (!path.empty()) {
                 path /= barrier::fs::u8path(SYS_CONFIG_NAME);
                 if (loadConfig(path.u8string())) {
diff --git a/src/lib/barrier/win32/DaemonApp.cpp b/src/lib/barrier/win32/DaemonApp.cpp
index 88e6b4ef..a3638d86 100644
--- a/src/lib/barrier/win32/DaemonApp.cpp
+++ b/src/lib/barrier/win32/DaemonApp.cpp
@@ -245,7 +245,7 @@ DaemonApp::logFilename()
 {
     string logFilename = ARCH->setting("LogFilename");
     if (logFilename.empty())
-        logFilename = DataDirectories::global() + "\\" + LOG_FILENAME;
+        logFilename = barrier::DataDirectories::global() + "\\" + LOG_FILENAME;
     MSWindowsUtil::createDirectory(logFilename, true);
     return logFilename;
 }
diff --git a/src/lib/common/DataDirectories.h b/src/lib/common/DataDirectories.h
index 4489ac24..5b7b0f51 100644
--- a/src/lib/common/DataDirectories.h
+++ b/src/lib/common/DataDirectories.h
@@ -15,10 +15,13 @@
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#pragma once
+#ifndef BARRIER_LIB_COMMON_DATA_DIRECTORIES_H
+#define BARRIER_LIB_COMMON_DATA_DIRECTORIES_H
 
 #include <string>
 
+namespace barrier {
+
 class DataDirectories
 {
 public:
@@ -40,3 +43,7 @@ private:
     static std::string _global;
     static std::string _systemconfig;
 };
+
+} // namespace barrier
+
+#endif
diff --git a/src/lib/common/DataDirectories_static.cpp b/src/lib/common/DataDirectories_static.cpp
index 5e28e055..5c3615eb 100644
--- a/src/lib/common/DataDirectories_static.cpp
+++ b/src/lib/common/DataDirectories_static.cpp
@@ -17,7 +17,8 @@
 
 #include "DataDirectories.h"
 
-// static member
+namespace barrier {
+
 std::string DataDirectories::_profile;
 std::string DataDirectories::_global;
 std::string DataDirectories::_systemconfig;
@@ -46,3 +47,5 @@ std::string DataDirectories::trusted_clients_ssl_fingerprints_path()
 {
     return ssl_fingerprints_path() + "/" + kFingerprintsTrustedClientsFilename;
 }
+
+} // namespace barrier
diff --git a/src/lib/common/unix/DataDirectories.cpp b/src/lib/common/unix/DataDirectories.cpp
index 608db05c..ee4947c6 100644
--- a/src/lib/common/unix/DataDirectories.cpp
+++ b/src/lib/common/unix/DataDirectories.cpp
@@ -22,6 +22,8 @@
 #include <sys/types.h> // getpwuid(_r)
 #include <pwd.h>       // getpwuid(_r)
 
+namespace barrier {
+
 const std::string ProfileSubdir = "/barrier";
 
 static std::string pw_dir(struct passwd* pwentp)
@@ -112,3 +114,5 @@ const std::string& DataDirectories::systemconfig(const std::string& path)
     _systemconfig = path;
     return _systemconfig;
 }
+
+} // namespace barrier
diff --git a/src/lib/common/win32/DataDirectories.cpp b/src/lib/common/win32/DataDirectories.cpp
index 32bc2136..0eeb6a20 100644
--- a/src/lib/common/win32/DataDirectories.cpp
+++ b/src/lib/common/win32/DataDirectories.cpp
@@ -20,6 +20,8 @@
 
 #include <Shlobj.h>
 
+namespace barrier {
+
 std::string known_folder_path(const KNOWNFOLDERID& id)
 {
     std::string path;
@@ -71,3 +73,5 @@ const std::string& DataDirectories::systemconfig(const std::string& path)
     _systemconfig = path;
     return _systemconfig;
 }
+
+} // namespace barrier
diff --git a/src/lib/net/SecureListenSocket.cpp b/src/lib/net/SecureListenSocket.cpp
index 2a9f84cb..bfaa4be0 100644
--- a/src/lib/net/SecureListenSocket.cpp
+++ b/src/lib/net/SecureListenSocket.cpp
@@ -56,7 +56,7 @@ SecureListenSocket::accept()
         }
 
         std::string certificateFilename = barrier::string::sprintf("%s/%s/%s",
-                                        DataDirectories::profile().c_str(),
+                                        barrier::DataDirectories::profile().c_str(),
                                         s_certificateDir,
                                         s_certificateFilename);
 
diff --git a/src/lib/net/SecureSocket.cpp b/src/lib/net/SecureSocket.cpp
index 9ac674d6..1a190381 100644
--- a/src/lib/net/SecureSocket.cpp
+++ b/src/lib/net/SecureSocket.cpp
@@ -674,7 +674,7 @@ SecureSocket::verifyCertFingerprint()
          barrier::format_ssl_fingerprint(fingerprint_sha1.data).c_str(),
          barrier::format_ssl_fingerprint(fingerprint_sha256.data).c_str()));
 
-    auto fingerprint_db_path = DataDirectories::trusted_servers_ssl_fingerprints_path();
+    auto fingerprint_db_path = barrier::DataDirectories::trusted_servers_ssl_fingerprints_path();
 
     // Provide debug hint as to what file is being used to verify fingerprint trust
     LOG((CLOG_NOTE "fingerprint_db_path: %s", fingerprint_db_path.c_str()));
diff --git a/src/lib/platform/MSWindowsHook.cpp b/src/lib/platform/MSWindowsHook.cpp
index b10d5c63..fce9020f 100644
--- a/src/lib/platform/MSWindowsHook.cpp
+++ b/src/lib/platform/MSWindowsHook.cpp
@@ -574,7 +574,7 @@ MSWindowsHook::install()
     g_fakeServerInput = false;
 
     // setup immune keys
-    g_immuneKeysPath = DataDirectories::profile() + "\\ImmuneKeys.txt";
+    g_immuneKeysPath = barrier::DataDirectories::profile() + "\\ImmuneKeys.txt";
     g_immuneKeys = immune_keys_list();
     LOG((CLOG_DEBUG "Found %u immune keys in %s", g_immuneKeys.size(), g_immuneKeysPath.c_str()));