diff --git a/include/llvm/ParameterAttributes.h b/include/llvm/ParameterAttributes.h
index 30bead70933..e1c2844bfeb 100644
--- a/include/llvm/ParameterAttributes.h
+++ b/include/llvm/ParameterAttributes.h
@@ -156,7 +156,7 @@ class ParamAttrsList {
       uint16_t index; ///< Index of the parameter for which the attributes apply
     };
 
-    SmallVector<ParamAttrsWithIndex,2> attrs; ///< The list of attributes
+    SmallVector<ParamAttrsWithIndex,4> attrs; ///< The list of attributes
   /// @}
 };