diff --git a/zsnes/src/makefile.ms b/zsnes/src/makefile.ms
index 8f213cb1..d83e3171 100644
--- a/zsnes/src/makefile.ms
+++ b/zsnes/src/makefile.ms
@@ -51,7 +51,7 @@ JMADIR=jma
 DELETECOMMAND=rm -f
 TRUTH=;true
 SLASH=/
-ASM=nasm
+ASM=nasmw
 ASMOPT=-O1
 ASMFLAGSORIG=
 COPT=-O3