diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index 1796dc9de95..53c9c902c2c 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -12,7 +12,7 @@
 
 #ifdef __cplusplus
 namespace blender::bke::sim {
-class ModifierSimulationCachePtr;
+struct ModifierSimulationCachePtr;
 }
 using ModifierSimulationCachePtrHandle = blender::bke::sim::ModifierSimulationCachePtr;
 #else