diff --git a/vlib/os/os.c.v b/vlib/os/os.c.v
index 0a4db523a2..2c00568d66 100644
--- a/vlib/os/os.c.v
+++ b/vlib/os/os.c.v
@@ -400,6 +400,8 @@ pub fn system(cmd string) int {
 		// overcome bug in system & _wsystem (cmd) when first char is quote `"`
 		wcmd := if cmd.len > 1 && cmd[0] == `"` && cmd[1] != `"` { '"${cmd}"' } else { cmd }
 		unsafe {
+			C.fflush(C.stdout)
+			C.fflush(C.stderr)
 			ret = C._wsystem(wcmd.to_wide())
 		}
 	} $else {