diff --git a/t/test-lib.sh b/t/test-lib.sh
index be3553e40e..898c2267b8 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1172,12 +1172,7 @@ test_atexit_handler () {
 check_test_results_san_file_has_entries_ () {
 	test -z "$TEST_RESULTS_SAN_FILE" && return 1
 
-	# stderr piped to /dev/null because the directory may have
-	# been "rmdir"'d already.
-	find "$TEST_RESULTS_SAN_DIR" \
-		-type f \
-		-name "$TEST_RESULTS_SAN_FILE_PFX.*" 2>/dev/null |
-	xargs grep ^DEDUP_TOKEN |
+	grep -s ^DEDUP_TOKEN "$TEST_RESULTS_SAN_FILE".* |
 	grep -qv sanitizer::GetThreadStackTopAndBottom
 }