diff --git a/src/engine/zsmOps.cpp b/src/engine/zsmOps.cpp
index b26e7a273..92b8aecb8 100644
--- a/src/engine/zsmOps.cpp
+++ b/src/engine/zsmOps.cpp
@@ -52,7 +52,7 @@ SafeWriter* DivEngine::saveZSM(unsigned int zsmrate, bool loop) {
         break;
       default:
         IGNORED++;
-        logD("Ignoring chip %d systemID %d",i,song.system[i]);
+        logD("Ignoring chip %d systemID %d",i,(int)song.system[i]);
         break;
     }
   }