diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 6ea1619..85383d0 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -2809,6 +2809,15 @@
   CXXMethodDecl *D = dyn_cast<CXXMethodDecl>(cxcursor::getCursorDecl(C));
   return (D && D->isStatic()) ? 1 : 0;
 }
+
+unsigned clang_isTagDeclDefinition(CXCursor C) {
+  if (!clang_isDeclaration(C.kind))
+    return 0;
+
+  const TagDecl *D = dyn_cast<TagDecl>(cxcursor::getCursorDecl(C));
+  return D && D->isDefinition() ? 1 : 0;
+}
+
 } // end: extern "C"
 
 //===----------------------------------------------------------------------===//