diff --git a/gui/gui.pro b/gui/gui.pro
index 841fe4383..5af7108a5 100644
--- a/gui/gui.pro
+++ b/gui/gui.pro
@@ -198,11 +198,11 @@ win32 {
 }
 
 contains(QMAKE_CC, gcc) {
-    QMAKE_CXXFLAGS += -std=c++11 -Wno-missing-field-initializers -Wno-missing-braces -Wno-sign-compare -Wno-deprecated-declarations
+    QMAKE_CXXFLAGS += -std=c++0x -pedantic -Wall -Wextra -Wcast-qual -Wno-deprecated-declarations -Wfloat-equal -Wmissing-declarations -Wmissing-format-attribute -Wno-long-long -Wpacked -Wredundant-decls -Wundef -Wno-shadow -Wno-missing-field-initializers -Wno-missing-braces -Wno-sign-compare -Wno-multichar
 }
 
 contains(QMAKE_CXX, clang++) {
-    QMAKE_CXXFLAGS += -std=c++11
+    QMAKE_CXXFLAGS += -std=c++0x -pedantic -Wall -Wextra -Wcast-qual -Wno-deprecated-declarations -Wfloat-equal -Wmissing-declarations -Wmissing-format-attribute -Wno-long-long -Wpacked -Wredundant-decls -Wundef -Wno-shadow -Wno-missing-field-initializers -Wno-missing-braces -Wno-sign-compare -Wno-multichar
 }
 
 contains(HAVE_QCHART, [yY][eE][sS]) {