diff --git a/src/ifcgeom/IfcGeomFunctions.cpp b/src/ifcgeom/IfcGeomFunctions.cpp
index 0c20ec98aa..de263b3755 100644
--- a/src/ifcgeom/IfcGeomFunctions.cpp
+++ b/src/ifcgeom/IfcGeomFunctions.cpp
@@ -2027,6 +2027,7 @@ bool IfcGeom::Kernel::convert_layerset(const IfcSchema::IfcProduct* product, std
 	}
 
 	if (positive) {
+		std::reverse(thicknesses.begin(), thicknesses.end());
 		std::reverse(styles.begin(), styles.end());
 		std::reverse(surfaces.begin(), surfaces.end());
 	}