diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index afc05d5..0812f4d 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -1046,7 +1046,7 @@
 	proto/window.pro \
 	$(NETBEANS_PRO)
 
-.SUFFIXES: .cod
+.SUFFIXES: .cod .i
 
 # Generate foo.cod (mixed source and assembly listing) from foo.c via "nmake
 # foo.cod"