diff --git a/Contractor/ContractionCleanup.h b/Contractor/ContractionCleanup.h
index 56669f78c..5d0ed183c 100644
--- a/Contractor/ContractionCleanup.h
+++ b/Contractor/ContractionCleanup.h
@@ -173,7 +173,7 @@ private:
 #pragma omp parallel for
         for ( int i = 0; i < ( int ) _graph.size(); i++ ) {
             for ( unsigned edge = _firstEdge[_graph[i].source]; edge < _firstEdge[_graph[i].source + 1]; ++edge ) {
-                if ( edge == i )
+                if ( edge == (unsigned)i )
                     continue;
                 if ( _graph[edge].target != _graph[i].target )
                     continue;