diff --git a/include/lsgrmGraphOperations.txx b/include/lsgrmGraphOperations.txx
index 63a884d35c87d8e69e84aa6a4f4cb9c3be398841..8919599ff2c3febe8cd92129c352deb568a866c0 100644
--- a/include/lsgrmGraphOperations.txx
+++ b/include/lsgrmGraphOperations.txx
@@ -86,7 +86,7 @@ MergeAllGraphsAndAchieveSegmentation(
   segmenter.SetNumberOfComponentsPerPixel(imageBands);
   segmenter.SetParam(params);
   segmenter.SetThreshold(threshold);
-  segmenter.SetDoFastSegmentation(true);
+  segmenter.SetDoFastSegmentation(false); // was true
   segmenter.SetNumberOfIterations(numberOfIterations);
 
   grm::GraphOperations<TSegmenter>::PerfomAllIterationsWithLMBFAndConstThreshold(segmenter);