diff --git a/tools/specmaker/Makefile.in b/tools/specmaker/Makefile.in
index e3c7bfdf173..c5388b90d10 100644
--- a/tools/specmaker/Makefile.in
+++ b/tools/specmaker/Makefile.in
@@ -26,7 +26,7 @@ specmaker: $(OBJS)
 install:: $(PROGRAMS)
 	[ -d $(bindir) ] || $(MKDIR) $(bindir)
 	$(INSTALL_PROGRAM) specmaker $(bindir)/specmaker
-	$(INSTALL_PROGRAM) function_grep.pl $(bindir)/function_grep.pl
+	$(INSTALL_PROGRAM) $(SRCDIR)/function_grep.pl $(bindir)/function_grep.pl
 
 uninstall::
 	$(RM) $(bindir)/specmaker