diff --git a/contrib/subtree/t/Makefile b/contrib/subtree/t/Makefile
index 3d278bb0ed..4655e0987b 100644
--- a/contrib/subtree/t/Makefile
+++ b/contrib/subtree/t/Makefile
@@ -51,6 +51,7 @@ clean-except-prove-cache:
 	$(RM) -r valgrind/bin
 
 clean: clean-except-prove-cache
+	$(RM) -r '$(TEST_RESULTS_DIRECTORY_SQ)'
 	$(RM) .prove
 
 test-lint: test-lint-duplicates test-lint-executable test-lint-shell-syntax
diff --git a/t/Makefile b/t/Makefile
index 3db48c0cb6..882782a519 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -73,6 +73,7 @@ clean-except-prove-cache: clean-chainlint
 	$(RM) -r valgrind/bin
 
 clean: clean-except-prove-cache
+	$(RM) -r '$(TEST_RESULTS_DIRECTORY_SQ)'
 	$(RM) .prove
 
 clean-chainlint: