diff --git a/src/libbitdht.pro b/src/libbitdht.pro
index cb96208..cb2f3b4 100644
--- a/src/libbitdht.pro
+++ b/src/libbitdht.pro
@@ -66,16 +66,6 @@ win32 {
 		# Switch on extra warnings
 		QMAKE_CFLAGS += -Wextra
 		QMAKE_CXXFLAGS += -Wextra
-
-		# Switch off optimization for release version
-		QMAKE_CXXFLAGS_RELEASE -= -O2
-		QMAKE_CXXFLAGS_RELEASE += -O0
-		QMAKE_CFLAGS_RELEASE -= -O2
-		QMAKE_CFLAGS_RELEASE += -O0
-
-		# Switch on optimization for debug version
-		#QMAKE_CXXFLAGS_DEBUG += -O2
-		#QMAKE_CFLAGS_DEBUG += -O2
 }
 
 ################################# MacOSX ##########################################