diff --git a/sys/windows/Makefile.nmake b/sys/windows/Makefile.nmake
index 2e1fcd30f..ab87543d1 100644
--- a/sys/windows/Makefile.nmake
+++ b/sys/windows/Makefile.nmake
@@ -805,7 +805,7 @@ NEED_USERSOUNDS=Y
 NEED_SEAUTOMAP=Y
 NEED_WAV=Y
 FMODROOT=..\lib\fmod\api\core
-SOUNDLIBINCL = $(SOUNDLIBINCL) -I$(FMODLIBROOT)/inc
+SOUNDLIBINCL = $(SOUNDLIBINCL) -I$(FMODROOT)/inc
 SOUNDLIBDEFS = $(SOUNDLIBDEFS) -DSND_LIB_FMOD
 TTYSOUNDOBJS = $(TTYSOUNDOBJS) $(OTTY)fmod.o
 GUISOUNDOBJS = $(GUISOUNDOBJS) $(OGUI)fmod.o