diff --git a/main/Makefile b/main/Makefile
index b18d1a0d48..af294dda67 100644
--- a/main/Makefile
+++ b/main/Makefile
@@ -26,7 +26,7 @@ OBJS=$(filter-out $(OBJSFILTER),$(SRC:.c=.o))
 # otherwise modules will not have them available if none of the static
 # objects use it.
 OBJS+=stdtime/localtime.o
-ifneq ($(findstring 1,$(WEAKREF)),1)
+ifneq ($(firstword $(subst :, ,$(WEAKREF))),1)
 OBJS+=../res/res_adsi.o
 endif