diff --git a/script/stream.py b/script/stream.py
index 32971ff..b614549 100755
--- a/script/stream.py
+++ b/script/stream.py
@@ -59,7 +59,7 @@ for line in f:
     grbl_out = '' 
     while sum(c_line) >= RX_BUFFER_SIZE-1 | s.inWaiting() :
         out_temp = s.readline().strip() # Wait for grbl response
-        if out_temp not in ['ok','error'] :
+        if out_temp.find('ok') < 0 and out_temp.find('error') < 0 :
             print "  Debug: ",out_temp # Debug response
         else :
             grbl_out += out_temp;