diff --git a/contrib/subtree/t/Makefile b/contrib/subtree/t/Makefile
index 4655e0987b..aa204d43b6 100644
--- a/contrib/subtree/t/Makefile
+++ b/contrib/subtree/t/Makefile
@@ -74,9 +74,7 @@ aggregate-results-and-cleanup: $(T)
 	$(MAKE) clean
 
 aggregate-results:
-	for f in '$(TEST_RESULTS_DIRECTORY_SQ)'/t*-*.counts; do \
-		echo "$$f"; \
-	done | '$(SHELL_PATH_SQ)' ../../../t/aggregate-results.sh
+	'$(SHELL_PATH_SQ)' ../../../t/aggregate-results.sh '$(TEST_RESULTS_DIRECTORY_SQ)'
 
 valgrind:
 	$(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
diff --git a/t/Makefile b/t/Makefile
index 2c2b252240..6ce79849e1 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -140,9 +140,7 @@ aggregate-results-and-cleanup: $(T)
 	$(MAKE) clean
 
 aggregate-results:
-	for f in '$(TEST_RESULTS_DIRECTORY_SQ)'/t*-*.counts; do \
-		echo "$$f"; \
-	done | '$(SHELL_PATH_SQ)' ./aggregate-results.sh
+	'$(SHELL_PATH_SQ)' ./aggregate-results.sh '$(TEST_RESULTS_DIRECTORY_SQ)'
 
 valgrind:
 	$(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
diff --git a/t/aggregate-results.sh b/t/aggregate-results.sh
index 7f2b83bdc8..6e3bcc4aec 100755
--- a/t/aggregate-results.sh
+++ b/t/aggregate-results.sh
@@ -8,7 +8,7 @@ broken=0
 total=0
 missing_prereq=
 
-while read file
+for file in "$1"/t*-*.counts
 do
 	while read type value
 	do