diff --git a/test/tools/Makefile b/test/tools/Makefile
index 87a7d1e83b..381d56422f 100644
--- a/test/tools/Makefile
+++ b/test/tools/Makefile
@@ -3,6 +3,8 @@ GO_BUILD=$(GO) build
 
 BUILDDIR := build
 
+SOURCES := $(shell find . -name '*.go')
+
 all: $(BUILDDIR)
 
 .PHONY: vendor
@@ -22,14 +24,14 @@ $(BUILDDIR): \
 	$(BUILDDIR)/git-validation \
 	$(BUILDDIR)/ginkgo
 
-$(BUILDDIR)/goimports:
+$(BUILDDIR)/goimports: $(SOURCES)
 	$(GO_BUILD) -o $@ ./vendor/golang.org/x/tools/cmd/goimports
 
-$(BUILDDIR)/go-md2man:
+$(BUILDDIR)/go-md2man: $(SOURCES)
 	$(GO_BUILD) -o $@ ./vendor/github.com/cpuguy83/go-md2man/v2
 
-$(BUILDDIR)/git-validation:
+$(BUILDDIR)/git-validation: $(SOURCES)
 	$(GO_BUILD) -o $@ ./vendor/github.com/vbatts/git-validation
 
-$(BUILDDIR)/ginkgo:
+$(BUILDDIR)/ginkgo: $(SOURCES)
 	$(GO_BUILD) -o $@ ./vendor/github.com/onsi/ginkgo/ginkgo