diff --git a/Makefrag b/Makefrag
index fcb14a9d..6d8eeb10 100644
--- a/Makefrag
+++ b/Makefrag
@@ -42,7 +42,7 @@ $(sim_dir)/libdramsim.a: $(DRAMSIM_OBJS)
 %.hex:
 	$(MAKE) -C $(dir $@) $(notdir $@)
 
-%.riscv.hex: %
+%.riscv.hex: %.riscv
 	$(MAKE) -C $(dir $@) $(notdir $@)
 
 #---------------------------------------------------------------------