diff --git a/code/X3D/X3DImporter.cpp b/code/X3D/X3DImporter.cpp
index 04589fd95..365761cf6 100644
--- a/code/X3D/X3DImporter.cpp
+++ b/code/X3D/X3DImporter.cpp
@@ -855,7 +855,7 @@ void X3DImporter::GeometryHelper_Extend_PolylineIdxToLineIdx(const std::list<int
 		{
 			std::list<int32_t>::const_iterator plit_next;
 
-			plit_next = ++plit, plit_next;
+			plit_next = plit, ++plit_next;
 			pLineCoordIdx.push_back(*plit);// second point of previous line.
 			pLineCoordIdx.push_back(-1);// delimiter
 			if((*plit_next == (-1)) || (plit_next == pPolylineCoordIdx.end())) break;// current polyline is finished