diff --git a/Makefile.mingw b/Makefile.mingw
index 5a8e8fc0..e2dae747 100644
--- a/Makefile.mingw
+++ b/Makefile.mingw
@@ -37,7 +37,8 @@ ifeq ($(USE_WIN32_APP), yes)
 	DAEMON_OBJS += $(patsubst %.rc,obj/%.o,$(DAEMON_RC))
 endif
 
-ifeq ($(USE_AESNI),yes)
+# don't change following line to ifeq ($(USE_AESNI),yes) !!!
+ifeq ($(USE_AESNI),1)
 	CPU_FLAGS = -maes -DAESNI
 else
 	CPU_FLAGS = -msse