diff --git a/pcbnew/connectivity_algo.cpp b/pcbnew/connectivity_algo.cpp
index 6086159577..88c99f7af7 100644
--- a/pcbnew/connectivity_algo.cpp
+++ b/pcbnew/connectivity_algo.cpp
@@ -825,7 +825,7 @@ void CN_CONNECTIVITY_ALGO::FindIsolatedCopperIslands( ZONE_CONTAINER* aZone, std
         }
     }
 
-    wxLogTrace( "CN", "Found %llu isolated islands\n", aIslands.size() );
+    wxLogTrace( "CN", "Found %u isolated islands\n", (unsigned)aIslands.size() );
 }