diff --git a/tools/codesighs/Makefile.in b/tools/codesighs/Makefile.in
index a1e8f50d1b8..b917a9e0b39 100644
--- a/tools/codesighs/Makefile.in
+++ b/tools/codesighs/Makefile.in
@@ -50,7 +50,7 @@ SIMPLE_PROGRAMS	= $(CSRCS:.c=$(BIN_SUFFIX))
 include $(topsrcdir)/config/config.mk
 
 ifeq ($(OS_ARCH),WINNT)
-LIBS += \
+OS_LIBS += \
 		imagehlp.lib \
 		$(NULL)
 endif