diff --git a/Makefile b/Makefile
index 9eb9462c..0bc9522b 100644
--- a/Makefile
+++ b/Makefile
@@ -1069,7 +1069,7 @@ ifeq ($(PLATFORM),emscripten)
   BASE_CFLAGS=-fPIC -s USE_SDL=2
   LDFLAGS=-s STACK_SIZE=5MB -s TOTAL_MEMORY=256MB -s MAX_WEBGL_VERSION=2 --preload-file $(BASEGAME)
   OPTIMIZEVM = -O3
-  OPTIMIZE = $(OPTIMIZEVM)
+  OPTIMIZE = $(OPTIMIZEVM) -ffast-math
 
   FULLBINEXT=.html