diff --git a/src/comm/OpalRT.h b/src/comm/OpalRT.h
index c5ed1d555f38ce0a2e9b0ee9fb00bbe0dcad47cd..6e3d7074d85251ea0e970b15f862d6b4ee3b9c59 100644
--- a/src/comm/OpalRT.h
+++ b/src/comm/OpalRT.h
@@ -41,7 +41,7 @@ namespace OpalRT
       Configuration info for the model
      */
 
-    const unsigned short NUM_OUTPUT_SIGNALS=57;
+    const unsigned short NUM_OUTPUT_SIGNALS=42;
 
     /*  ------------------------------ Outputs ------------------------------
     *