diff --git a/src/gui/src/IpcClient.cpp b/src/gui/src/IpcClient.cpp
index da06ace4..1b0e147a 100644
--- a/src/gui/src/IpcClient.cpp
+++ b/src/gui/src/IpcClient.cpp
@@ -106,7 +106,7 @@ void IpcClient::sendCommand(const QString& command, ElevateMode const elevate)
 
     std::string stdStringCommand = command.toStdString();
     const char* charCommand = stdStringCommand.c_str();
-    int length = strlen(charCommand);
+    int length = (int)strlen(charCommand);
 
     char lenBuf[4];
     intToBytes(length, lenBuf, 4);
diff --git a/src/lib/arch/IArchString.cpp b/src/lib/arch/IArchString.cpp
index 13e1a83d..f618c125 100644
--- a/src/lib/arch/IArchString.cpp
+++ b/src/lib/arch/IArchString.cpp
@@ -91,13 +91,14 @@ IArchString::convStringWCToMB(char* dst,
     }
     ARCH->unlockMutex(s_mutex);
 
-    return len;
+    return (int)len;
 }
 
 int
 IArchString::convStringMBToWC(wchar_t* dst,
-                const char* src, UInt32 n, bool* errors)
+                const char* src, UInt32 n_param, bool* errors)
 {
+    ptrdiff_t n = (ptrdiff_t)n_param; // fix compiler warning
     ptrdiff_t len = 0;
     wchar_t dummy;
 
@@ -185,5 +186,5 @@ IArchString::convStringMBToWC(wchar_t* dst,
     }
     ARCH->unlockMutex(s_mutex);
 
-    return len;
+    return (int)len;
 }
diff --git a/src/lib/base/Log.cpp b/src/lib/base/Log.cpp
index e0ada2f0..823bf6d1 100644
--- a/src/lib/base/Log.cpp
+++ b/src/lib/base/Log.cpp
@@ -180,7 +180,7 @@ Log::print(const char* file, int line, const char* fmt, ...)
         sprintf(timestamp, "%04i-%02i-%02iT%02i:%02i:%02i", tm->tm_year + 1900, tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
 
         // square brackets, spaces, comma and null terminator take about 10
-        int size = 10;
+        size_t size = 10;
         size += strlen(timestamp);
         size += strlen(g_priority[priority]);
         size += strlen(buffer);
diff --git a/src/lib/net/TCPSocket.cpp b/src/lib/net/TCPSocket.cpp
index fbb40587..18666f3d 100644
--- a/src/lib/net/TCPSocket.cpp
+++ b/src/lib/net/TCPSocket.cpp
@@ -337,7 +337,7 @@ TCPSocket::doRead()
         
         // slurp up as much as possible
         do {
-            m_inputBuffer.write(buffer, bytesRead);
+            m_inputBuffer.write(buffer, (UInt32)bytesRead);
 
             bytesRead = ARCH->readSocket(m_socket, buffer, sizeof(buffer));
         } while (bytesRead > 0);