diff --git a/tools/testing/selftests/mm/cow.c b/tools/testing/selftests/mm/cow.c
index dbbcc5eb3dce..0adc0ab142c1 100644
--- a/tools/testing/selftests/mm/cow.c
+++ b/tools/testing/selftests/mm/cow.c
@@ -113,11 +113,11 @@ struct comm_pipes {
 static int setup_comm_pipes(struct comm_pipes *comm_pipes)
 {
 	if (pipe(comm_pipes->child_ready) < 0) {
-		ksft_perror("pipe()");
+		ksft_perror("pipe() failed");
 		return -errno;
 	}
 	if (pipe(comm_pipes->parent_ready) < 0) {
-		ksft_perror("pipe()");
+		ksft_perror("pipe() failed");
 		close(comm_pipes->child_ready[0]);
 		close(comm_pipes->child_ready[1]);
 		return -errno;