diff --git a/Makefile b/Makefile
index fc62522..00dc4a5 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ all: $(HEXFILE)
 # compatibility define the file type manually.
 
 rxcode.asm: generate_rxcode.sh
-	generate_rxcode.sh > rxcode.asm
+	./generate_rxcode.sh > rxcode.asm
 
 maplebus.o: maplebus.c rxcode.asm
 	$(CC) $(CFLAGS) -c $< -o $@