diff --git a/gui/gui.pro b/gui/gui.pro
index d46511e40..151f8b4dc 100644
--- a/gui/gui.pro
+++ b/gui/gui.pro
@@ -147,5 +147,5 @@ win32 {
 }
 
 unix {
-    QMAKE_CXXFLAGS += -std=c++11
+    QMAKE_CXXFLAGS += -std=c++0x
 }