diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index b2505c0f7d..38db01023a 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -52,6 +52,8 @@
 #   define APCK_SIZE 16
 #endif
 
+struct SwsContext;
+
 typedef int (*SwsFunc)(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
              int srcSliceH, uint8_t* dst[], int dstStride[]);