diff --git a/reactos/lib/rtl/bitmap.c b/reactos/lib/rtl/bitmap.c
index 27328367d21..c0aef4f7a71 100644
--- a/reactos/lib/rtl/bitmap.c
+++ b/reactos/lib/rtl/bitmap.c
@@ -600,7 +600,7 @@ RtlFindNextForwardRunSet(
 
     /* Assume a clear run first, count it's length */
     Length = RtlpGetLengthOfRunClear(BitMapHeader, FromIndex, MAXULONG);
-    *StartingRunIndex = FromIndex;
+    *StartingRunIndex = FromIndex + Length;
 
     /* Now return the length of the run */
     return RtlpGetLengthOfRunSet(BitMapHeader, FromIndex, MAXULONG);