diff --git a/src/Image/Image_AlienPixMap.cxx b/src/Image/Image_AlienPixMap.cxx
index 3ee7570e5c..353ff1d5ff 100644
--- a/src/Image/Image_AlienPixMap.cxx
+++ b/src/Image/Image_AlienPixMap.cxx
@@ -1251,6 +1251,7 @@ bool Image_AlienPixMap::Save (Standard_Byte* theBuffer,
   }
   return true;
 #else
+  (void)theLength;
   if (theBuffer != NULL)
   {
     Message::SendFail ("Error: no image library available");