diff --git a/mozilla/security/nss/cmd/Makefile b/mozilla/security/nss/cmd/Makefile
index 8440062ccff..ac3be75ad8d 100644
--- a/mozilla/security/nss/cmd/Makefile
+++ b/mozilla/security/nss/cmd/Makefile
@@ -14,7 +14,7 @@ ifdef BUILD_LIBPKIX_TESTS
 DIRS += libpkix
 endif
 
-LOWHASHTEST_SRCDIR = ""
+LOWHASHTEST_SRCDIR=
 ifeq ($(FREEBL_LOWHASH),1)
 LOWHASHTEST_SRCDIR = lowhashtest  # Add the lowhashtest directory to DIRS.
 endif