diff --git a/dust3d.pro b/dust3d.pro
index caabab42..b30d8c7f 100644
--- a/dust3d.pro
+++ b/dust3d.pro
@@ -96,13 +96,29 @@ DEFINES += "PROJECT_DEFINED_APP_REFERENCE_GUIDE_URL=\"\\\"$$REFERENCE_GUIDE_URL\
 DEFINES += "PROJECT_DEFINED_APP_UPDATES_CHECKER_URL=\"\\\"$$UPDATES_CHECKER_URL\\\"\""
 DEFINES += "PROJECT_DEFINED_APP_PLATFORM=\"\\\"$$PLATFORM\\\"\""
 
-QMAKE_CXXFLAGS_RELEASE -= -O
-QMAKE_CXXFLAGS_RELEASE -= -O1
-QMAKE_CXXFLAGS_RELEASE -= -O2
+macx {
+	QMAKE_CXXFLAGS_RELEASE -= -O
+	QMAKE_CXXFLAGS_RELEASE -= -O1
+	QMAKE_CXXFLAGS_RELEASE -= -O2
 
-QMAKE_CXXFLAGS_RELEASE += -O3
+	QMAKE_CXXFLAGS_RELEASE += -O3
 
-QMAKE_CXXFLAGS += -std=c++11
+	QMAKE_CXXFLAGS += -std=c++11
+}
+
+unix:!macx {
+	QMAKE_CXXFLAGS_RELEASE -= -O
+	QMAKE_CXXFLAGS_RELEASE -= -O1
+	QMAKE_CXXFLAGS_RELEASE -= -O2
+
+	QMAKE_CXXFLAGS_RELEASE += -O3
+
+	QMAKE_CXXFLAGS += -std=c++11
+}
+
+win32 {
+	QMAKE_CXXFLAGS += /O2
+}
 
 include(thirdparty/QtAwesome/QtAwesome/QtAwesome.pri)