diff --git a/Makefile.mingw b/Makefile.mingw
index e2dae747..40cf14b3 100644
--- a/Makefile.mingw
+++ b/Makefile.mingw
@@ -39,9 +39,13 @@ endif
 
 # don't change following line to ifeq ($(USE_AESNI),yes) !!!
 ifeq ($(USE_AESNI),1)
-	CPU_FLAGS = -maes -DAESNI
+	CPU_FLAGS += -maes -DAESNI
 else
-	CPU_FLAGS = -msse
+	CPU_FLAGS += -msse
+endif
+
+ifeq ($(USE_AVX),1)
+	CPU_FLAGS += -mavx
 endif
 
 ifeq ($(USE_ASLR),yes)