diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 131d9d6db867..779ef2d5f1b9 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -156,6 +156,7 @@ static bool is_range_mapped(FILE *maps_fp, unsigned long start,
 		}
 	}
 
+	free(line);
 	return success;
 }