diff --git a/src/platform/posix/init.c b/src/platform/posix/init.c
index 0bccefa9..e91f8cff 100644
--- a/src/platform/posix/init.c
+++ b/src/platform/posix/init.c
@@ -49,6 +49,9 @@ platform_init(void)
 	platform_sigaction(SIGABRT);
 	platform_sigaction(SIGSEGV);
 	platform_sigaction(SIGBUS);
+
+	setvbuf(stdout, 0, _IOLBF, 0);
+	setvbuf(stderr, 0, _IOLBF, 0);
 }
 
 void