diff --git a/Makefile b/Makefile
index 4c939122..e2fe1d13 100644
--- a/Makefile
+++ b/Makefile
@@ -558,7 +558,7 @@ ifeq ($(PLATFORM),mingw32)
   ifeq ($(ARCH),x86_64)
     OPTIMIZEVM = -O3 -fno-omit-frame-pointer \
       -funroll-loops -falign-functions=2 -fstrength-reduce
-    OPTIMIZE = $(OPTIMIZEVM) --fast-math
+    OPTIMIZE = $(OPTIMIZEVM) -ffast-math
     HAVE_VM_COMPILED = true
   endif
   ifeq ($(ARCH),x86)