diff --git a/Makefile b/Makefile
index d556c195..20591f8e 100644
--- a/Makefile
+++ b/Makefile
@@ -354,7 +354,7 @@ ifeq ($(PLATFORM),darwin)
     LDFLAGS += -framework Carbon
   endif
   ifeq ($(ARCH),i386)
-    OPTIMIZE += -msse2
+    OPTIMIZE += -march=prescott -mfpmath=sse
     # x86 vm will crash without -mstackrealign since MMX instructions will be
     # used no matter what and they corrupt the frame pointer in VM calls
     BASE_CFLAGS += -mstackrealign
@@ -403,7 +403,7 @@ ifeq ($(PLATFORM),darwin)
     #CLIENT_LDFLAGS += -L/usr/X11R6/$(LIB) -lX11 -lXext -lXxf86dga -lXxf86vm
   endif
 
-  OPTIMIZE += -O3 -ffast-math -falign-loops=16
+  OPTIMIZE += -ffast-math -falign-loops=16
 
   ifneq ($(HAVE_VM_COMPILED),true)
     BASE_CFLAGS += -DNO_VM_COMPILED