diff --git a/test/Makefile b/test/Makefile
index 4c65d7c015..cf1983f6b4 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -2,7 +2,7 @@ LEVEL = ../../..
 include $(LEVEL)/Makefile.common
 
 # Test in all immediate subdirectories if unset.
-TESTDIRS ?= $(shell echo $(PROJ_SRC_DIR)/*/)
+TESTDIRS ?= .
 
 ifndef TESTARGS
 ifdef VERBOSE