diff --git a/libavcodec/snow_dwt.h b/libavcodec/snow_dwt.h
index e2d7528056..ee699de35e 100644
--- a/libavcodec/snow_dwt.h
+++ b/libavcodec/snow_dwt.h
@@ -24,6 +24,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+struct MpegEncContext;
+
 typedef int DWTELEM;
 typedef short IDWTELEM;