diff --git a/sdk/include/xdk/rtlfuncs.h b/sdk/include/xdk/rtlfuncs.h
index 276cfaf6cf9..88fd0f76baa 100644
--- a/sdk/include/xdk/rtlfuncs.h
+++ b/sdk/include/xdk/rtlfuncs.h
@@ -673,6 +673,14 @@ RtlFindNextForwardRunClear(
   _In_ ULONG FromIndex,
   _Out_ PULONG StartingRunIndex);
 
+NTSYSAPI
+ULONG
+NTAPI
+RtlFindNextForwardRunSet(
+  _In_ PRTL_BITMAP BitMapHeader,
+  _In_ ULONG FromIndex,
+  _Out_ PULONG StartingRunIndex);
+
 _Success_(return != -1)
 _Must_inspect_result_
 NTSYSAPI