diff --git a/libs/opmapcontrol/src/internals/tilematrix.cpp b/libs/opmapcontrol/src/internals/tilematrix.cpp
index 626917e5ad4417b10d653d0c283e706caa24b950..ce96a1a7d19fca86d331f1a3f7df3eabc8bb4d23 100644
--- a/libs/opmapcontrol/src/internals/tilematrix.cpp
+++ b/libs/opmapcontrol/src/internals/tilematrix.cpp
@@ -108,7 +108,6 @@ void TileMatrix::ClearPointsNotIn(QList<Point>list)
             removals.append(p);
         }
     }
-    mutex.unlock();
     foreach(Point p,removals)
     {
         Tile* t=matrix.value(p, 0);