diff --git a/src/ifcgeom_schema_agnostic/GeometrySerializer.h b/src/ifcgeom_schema_agnostic/GeometrySerializer.h
index ccea3ff729..6e000247a3 100644
--- a/src/ifcgeom_schema_agnostic/GeometrySerializer.h
+++ b/src/ifcgeom_schema_agnostic/GeometrySerializer.h
@@ -30,25 +30,25 @@ public:
     {
         /// Use entity names instead of unique IDs for naming elements.
         /// Applicable for OBJ, DAE, and SVG output.
-        USE_ELEMENT_NAMES = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 1),
+        USE_ELEMENT_NAMES = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 1U),
         /// Use entity GUIDs instead of unique IDs for naming elements.
         /// Applicable for OBJ, DAE, and SVG output.
-        USE_ELEMENT_GUIDS = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 2),
+        USE_ELEMENT_GUIDS = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 2U),
         /// Use material names instead of unique IDs for naming materials.
         /// Applicable for OBJ and DAE output.
-        USE_MATERIAL_NAMES = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 3),
+        USE_MATERIAL_NAMES = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 3U),
 		/// Use element types instead of unique IDs for naming elements.
 		/// Applicable for DAE output.
-		USE_ELEMENT_TYPES = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 4),
+		USE_ELEMENT_TYPES = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 4U),
 		/// Order the elements using their IfcBuildingStorey parent
 		/// Applicable for DAE output
-		USE_ELEMENT_HIERARCHY = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 5),
+		USE_ELEMENT_HIERARCHY = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 5U),
         /// Use step ids for naming elements.
 		/// Applicable for OBJ, DAE, and SVG output.
-		USE_ELEMENT_STEPIDS = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 6),
+		USE_ELEMENT_STEPIDS = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 6U),
 		/// Use Y UP .
 		/// Applicable for OBJ output.
-		USE_Y_UP = 1 << (IfcGeom::IteratorSettings::NUM_SETTINGS + 7),
+		USE_Y_UP = 1U << (IfcGeom::IteratorSettings::NUM_SETTINGS + 7U),
 		/// Number of different setting flags.
         NUM_SETTINGS = 7
     };