diff --git a/src/HexExtractor.cc b/src/HexExtractor.cc
index ae2cb876e018297e6564bc5459219a834270ca37..fb2371caa7495ab9718026f51e1adacae7ebcadc 100644
--- a/src/HexExtractor.cc
+++ b/src/HexExtractor.cc
@@ -148,7 +148,7 @@ void HexExtractor::extractHVertices()
     for (auto fh : inputMesh.faces())
         incidentVerticesPerFace[fh].clear();
     for (auto ch : inputMesh.cells())
-        incidentVerticesPerFace[ch].clear();
+        incidentVerticesPerCell[ch].clear();
 
 
     HEXEX_DEBUG_ONLY(std::cout << "Extracting vertices on vertices" << std::endl;)