diff --git a/testing/mozbase/Makefile.in b/testing/mozbase/Makefile.in
index 590c276fe35f..f2b77a3f5024 100644
--- a/testing/mozbase/Makefile.in
+++ b/testing/mozbase/Makefile.in
@@ -9,6 +9,10 @@ VPATH = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
+PYTHON_UNIT_TESTS := \
+  test.py \
+  $(NULL)
+
 include $(topsrcdir)/config/rules.mk
 
 # Harness packages from the srcdir;