diff --git a/src/gui/gui.pro b/src/gui/gui.pro
index 39d92402..cedb2f7a 100644
--- a/src/gui/gui.pro
+++ b/src/gui/gui.pro
@@ -40,8 +40,8 @@ SOURCES += src/main.cpp \
     src/IpcReader.cpp \
     src/Ipc.cpp \
     src/SynergyLocale.cpp \
-	src/QUtility.cpp \
-	src/PremiumAuth.cpp
+    src/QUtility.cpp \
+    src/PremiumAuth.cpp
 HEADERS += src/MainWindow.h \
     src/AboutDialog.h \
     src/ServerConfig.h \
@@ -56,7 +56,7 @@ HEADERS += src/MainWindow.h \
     src/HotkeyDialog.h \
     src/ActionDialog.h \
     src/Hotkey.h \
-	src/Action.h \
+    src/Action.h \
     src/KeySequence.h \
     src/KeySequenceWidget.h \
     src/SettingsDialog.h \
@@ -68,8 +68,8 @@ HEADERS += src/MainWindow.h \
     src/IpcReader.h \
     src/Ipc.h \
     src/SynergyLocale.h \
-	src/QUtility.h \
-	src/PremiumAuth.h
+    src/QUtility.h \
+    src/PremiumAuth.h
 RESOURCES += res/Synergy.qrc
 RC_FILE = res/win/Synergy.rc
 macx {