diff --git a/test/run-spec-test.py b/test/run-spec-test.py
index 3f74dcc..ac938dc 100755
--- a/test/run-spec-test.py
+++ b/test/run-spec-test.py
@@ -229,8 +229,8 @@ class Wasm3():
         raise Exception(error)
 
     def _write(self, data):
-        if not self._is_running():
-            raise Exception("Not running")
+        #if not self._is_running():
+        #    raise Exception("Not running")
         self.p.stdin.write(data.encode("utf-8"))
         self.p.stdin.flush()