diff --git a/mozilla/security/coreconf/rules.mk b/mozilla/security/coreconf/rules.mk
index 9ef3312e06b..4b4568790b2 100644
--- a/mozilla/security/coreconf/rules.mk
+++ b/mozilla/security/coreconf/rules.mk
@@ -418,11 +418,13 @@ else
 	$(CC) -o $@ -c $(CFLAGS) $<
 endif
 
+ifndef XP_OS2_VACPP
 ifneq (,$(filter-out WIN%,$(OS_TARGET)))
 $(OBJDIR)/$(PROG_PREFIX)%$(OBJ_SUFFIX): %.s
 	@$(MAKE_OBJDIR)
 	$(AS) -o $@ $(ASFLAGS) -c $<
 endif
+endif
 
 $(OBJDIR)/$(PROG_PREFIX)%$(OBJ_SUFFIX): %.asm
 	@$(MAKE_OBJDIR)