1 files changed, 6 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/Action.cs b/src/mscorlib/shared/System/Action.cs
index b82c14d9dc..da6813829e 100644
--- a/src/mscorlib/shared/System/Action.cs
+++ b/src/mscorlib/shared/System/Action.cs
@@ -33,3 +33,9 @@ namespace System
 
     public delegate bool Predicate<in T>(T obj);
 }
+
+namespace System.Buffers
+{
+    public delegate void SpanAction<T, in TArg>(Span<T> span, TArg arg);
+    public delegate void ReadOnlySpanAction<T, in TArg>(ReadOnlySpan<T> span, TArg arg);
+}