diff --git a/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake b/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
index 3c302bca..d6141599 100644
--- a/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
+++ b/crypto_kem/kyber768/clean/Makefile.Microsoft_nmake
@@ -4,7 +4,7 @@
 LIB=libkyber768_clean.lib
 OBJECTS=cbd.obj indcpa.obj kem.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)