diff --git a/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake b/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
index 13f3d73a..d6f0fab3 100644
--- a/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
+++ b/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
@@ -2,7 +2,7 @@ LIB=libkyber768_clean.lib
 
 OBJECTS=cbd.obj indcpa.obj kem.obj kex.obj ntt.obj poly.obj polyvec.obj precomp.obj reduce.obj verify.obj
 
-CFLAGS=/I ..\..\..\common /W1 /WX # FIXME: ideally would use /W4 instead of /W1, but too many failures in Kyber right now
+CFLAGS=/I ..\..\..\common /W4 /WX # FIXME: ideally would use /W4 instead of /W1, but too many failures in Kyber right now
 
 all: $(LIB)