1 files changed, 6 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_subsurf.h b/source/blender/blenkernel/BKE_subsurf.h
index 92170325113..d7b9d20d7b0 100644
--- a/source/blender/blenkernel/BKE_subsurf.h
+++ b/source/blender/blenkernel/BKE_subsurf.h
@@ -34,6 +34,9 @@
 /* struct DerivedMesh is used directly */
 #include "BKE_DerivedMesh.h"
 
+/* Thread sync primitives used directly.  */
+#include "BLI_threads.h"
+
 struct CCGElem;
 struct DMFlagMat;
 struct DMGridAdjacency;
@@ -140,6 +143,9 @@ typedef struct CCGDerivedMesh {
 	} multires;
 
 	struct EdgeHash *ehash;
+
+	ThreadRWMutex loops_cache_rwlock;
+	ThreadRWMutex origindex_cache_rwlock;
 } CCGDerivedMesh;
 
 #ifdef WITH_OPENSUBDIV