diff --git a/src/analysis/vector/qgsgeometrysnappersinglesource.cpp b/src/analysis/vector/qgsgeometrysnappersinglesource.cpp
index 1805d32aca3..964cbf14a20 100644
--- a/src/analysis/vector/qgsgeometrysnappersinglesource.cpp
+++ b/src/analysis/vector/qgsgeometrysnappersinglesource.cpp
@@ -244,7 +244,7 @@ static bool snapLineString( QgsLineString *linestring, QgsSpatialIndex &index, Q
     if ( !newVerticesAlongSegment.isEmpty() )
     {
       // sort by distance along the segment
-      std::sort( newVerticesAlongSegment.begin(), newVerticesAlongSegment.end(), []( const AnchorAlongSegment & p1, const AnchorAlongSegment & p2 )
+      std::sort( newVerticesAlongSegment.begin(), newVerticesAlongSegment.end(), []( AnchorAlongSegment p1, AnchorAlongSegment p2 )
       {
         return p1.along < p2.along;
       } );