diff --git a/interpreter/Makefile b/interpreter/Makefile
index f7ecc482ae..688bbc1aa8 100644
--- a/interpreter/Makefile
+++ b/interpreter/Makefile
@@ -47,7 +47,7 @@ $(JSLIB):
 # Unit tests
 
 UNITTESTDIR =	unittest
-UNITTESTFILES =	$(shell cd $(UNITTESTDIR); ls *.ml)
+UNITTESTFILES =	$(shell cd $(UNITTESTDIR) > /dev/null; ls *.ml)
 UNITTESTS =	$(UNITTESTFILES:%.ml=%)
 
 .PHONY: unittest
@@ -62,7 +62,7 @@ unittest/%:
 # Test suite
 
 TESTDIR =	../test/core
-TESTFILES =	$(shell cd $(TESTDIR); ls *.wast; ls [a-z]*/*.wast)
+TESTFILES =	$(shell cd $(TESTDIR) > /dev/null; ls *.wast; ls [a-z]*/*.wast)
 TESTS =		$(TESTFILES:%.wast=%)
 
 .PHONY: test partest quiettest