Call make with the current instance if possible.
--- a/Makefile.am
+++ b/Makefile.am
@@ -17,12 +17,12 @@ apidox:
 check: test
 
 test:
-	make -C src test
+	$(MAKE) -C src test
 
 leakcheck: leaktest
 
 leaktest:
-	make -C src leaktest
+	$(MAKE) -C src leaktest
 
 includetest:
-	make -C src includetest
+	$(MAKE) -C src includetest
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -117,12 +117,12 @@ noinst_HEADERS = config.h prep.h dns.h nonsaslauth.h mucmessagesession.h stanzae
 EXTRA_DIST = version.rc
 
 test:
-	make -C tests test
+	$(MAKE) -C tests test
 
 check: test
 
 leaktest:
-	make -C tests leaktest
+	$(MAKE) -C tests leaktest
 
 leakcheck: leaktest