diff --git a/Makefile b/Makefile
index ad8641efb..9aa4c0e35 100644
--- a/Makefile
+++ b/Makefile
@@ -204,16 +204,16 @@ build/flatgems: | build vendor/bundle
 	done
 
 flatjar-test:
-	cd build; GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-flatjar.jar rspec $(TESTS)
+	cd build && GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-flatjar.jar rspec $(TESTS)
 
 jar-test:
-	cd build; GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-monolithic.jar rspec $(TESTS)
+	cd build && GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-monolithic.jar rspec $(TESTS)
 
 flatjar-test-and-report:
-	cd build; GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-monolithic.jar rspec $(TESTS) --format h > build/results.flatjar.html
+	cd build && GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-monolithic.jar rspec $(TESTS) --format h > results.flatjar.html
 
 jar-test-and-report:
-	cd build; GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-monolithic.jar rspec $(TESTS) --format h > build/results.monolithic.html
+	cd build && GEM_HOME= GEM_PATH= java -jar logstash-$(VERSION)-monolithic.jar rspec $(TESTS) --format h > results.monolithic.html
 
 flatjar: build/logstash-$(VERSION)-flatjar.jar
 build/jar: | build build/flatgems build/monolith