diff --git a/libavfilter/buffersrc.h b/libavfilter/buffersrc.h
index c7225b6752..75824d964d 100644
--- a/libavfilter/buffersrc.h
+++ b/libavfilter/buffersrc.h
@@ -38,19 +38,19 @@ enum {
     /**
      * Do not check for format changes.
      */
-    AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1,
+    AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1 << 0,
 
     /**
      * Immediately push the frame to the output.
      */
-    AV_BUFFERSRC_FLAG_PUSH = 4,
+    AV_BUFFERSRC_FLAG_PUSH = 1 << 2,
 
     /**
      * Keep a reference to the frame.
      * If the frame if reference-counted, create a new reference; otherwise
      * copy the frame data.
      */
-    AV_BUFFERSRC_FLAG_KEEP_REF = 8,
+    AV_BUFFERSRC_FLAG_KEEP_REF = 1 << 3,
 
 };