diff --git a/include/clang-c/Index.h b/include/clang-c/Index.h
index 8b0aed1..9da6b23 100644
--- a/include/clang-c/Index.h
+++ b/include/clang-c/Index.h
@@ -4239,13 +4239,6 @@
 } CXIdxObjCContainerDeclInfo;
 
 typedef struct {
-  const CXIdxObjCContainerDeclInfo *containerInfo;
-  const CXIdxEntityInfo *objcClass;
-  CXCursor classCursor;
-  CXIdxLoc classLoc;
-} CXIdxObjCCategoryDeclInfo;
-
-typedef struct {
   const CXIdxEntityInfo *base;
   CXCursor cursor;
   CXIdxLoc loc;
@@ -4269,6 +4262,14 @@
 } CXIdxObjCInterfaceDeclInfo;
 
 typedef struct {
+  const CXIdxObjCContainerDeclInfo *containerInfo;
+  const CXIdxEntityInfo *objcClass;
+  CXCursor classCursor;
+  CXIdxLoc classLoc;
+  const CXIdxObjCProtocolRefListInfo *protocols;
+} CXIdxObjCCategoryDeclInfo;
+
+typedef struct {
   const CXIdxDeclInfo *declInfo;
   const CXIdxBaseClassInfo *const *bases;
   unsigned numBases;