diff --git a/util/spd_tools/Makefile b/util/spd_tools/Makefile
index d8806724fa..3aad91c976 100644
--- a/util/spd_tools/Makefile
+++ b/util/spd_tools/Makefile
@@ -3,11 +3,11 @@ PART_ID_GEN = bin/part_id_gen
 
 all: $(SPD_GEN) $(PART_ID_GEN)
 
-$(SPD_GEN):
-	go build -o $(SPD_GEN) src/spd_gen/*.go
+$(SPD_GEN): src/spd_gen/*.go
+	go build -o $@ $^
 
-$(PART_ID_GEN):
-	go build -o $(PART_ID_GEN) src/part_id_gen/*.go
+$(PART_ID_GEN): src/part_id_gen/*.go
+	go build -o $@ $^
 
 clean:
 	rm -rf bin/