diff --git a/src/module/io.c b/src/module/io.c
index ac5a5f6d..785de67f 100644
--- a/src/module/io.c
+++ b/src/module/io.c
@@ -532,7 +532,15 @@ void stdinIsTerminal(WrenVM* vm)
 
 void stdoutFlush(WrenVM* vm)
 {
-  fflush(stdout);
+  wrenEnsureSlots(vm, 1);
+
+  int result = fflush(stdout);
+  if (result != 0) {
+    wrenSetSlotString(vm, 0, "Cannot flush Stdout.");
+    wrenAbortFiber(vm, 0);
+    return;
+  }
+  
   wrenSetSlotNull(vm, 0);
 }