diff --git a/config/rules.mk b/config/rules.mk
index 96071ca2e3c..792a877cfd1 100644
--- a/config/rules.mk
+++ b/config/rules.mk
@@ -274,7 +274,7 @@ ifndef USE_AUTOCONF
 		if test -f UNIX.mk.orig; then rm -f UNIX.mk; mv UNIX.mk.orig UNIX.mk; else true; fi; \
 		mv UNIX.mk UNIX.mk.orig; \
 		awk '/^OBJDIR_NAME[ 	]*=/ { \
-			printf("OBJDIR_NAME\t= %s%s%s%s%s%s.OBJ\n","$(OS_CONFIG)","$(OS_VERSION)","$(PROCESSOR_ARCHITECTURE)","$(COMPILER)","$(IMPL_STRATEGY)","$(OBJDIR_TAG)"); next} {print}' UNIX.mk.orig > UNIX.mk)
+			printf("OBJDIR_NAME\t= %s%s%s%s%s%s.OBJ\n","$$(OS_CONFIG)","$$(OS_VERSION)","$$(PROCESSOR_ARCHITECTURE)","$$(COMPILER)","$$(IMPL_STRATEGY)","$$(OBJDIR_TAG)"); next} {print}' UNIX.mk.orig > UNIX.mk)
 endif # ! USE_AUTOCONF
 
 ifdef ALL_PLATFORMS