diff --git a/lib/msun/tests/fenv_test.c b/lib/msun/tests/fenv_test.c
--- a/lib/msun/tests/fenv_test.c
+++ b/lib/msun/tests/fenv_test.c
@@ -539,6 +539,8 @@
 int
 main(void)
 {
+	/* Avoid double output after fork() */
+	setvbuf(stdout, NULL, _IONBF, 0);
 
 	printf("1..8\n");
 	init_exceptsets();