diff --git a/include/clang-c/CXCppInterOp.h b/include/clang-c/CXCppInterOp.h
index 2d5cafc25..6c64dc554 100644
--- a/include/clang-c/CXCppInterOp.h
+++ b/include/clang-c/CXCppInterOp.h
@@ -817,7 +817,7 @@ typedef void* CXObject;
 /**
  * Allocates memory for the given type.
  */
-CXObject clang_allocate(CXScope S);
+CXObject clang_allocate(unsigned int n);
 
 /**
  * Deallocates memory for a given class.