diff --git a/libavfilter/stack_internal.h b/libavfilter/stack_internal.h
index ace8886152..b4f9b92223 100644
--- a/libavfilter/stack_internal.h
+++ b/libavfilter/stack_internal.h
@@ -19,6 +19,10 @@
 #ifndef AVFILTER_STACK_INTERNAL_H
 #define AVFILTER_STACK_INTERNAL_H
 
+#ifdef HWContext
+
+#include "libavfilter/framesync.h"
+
 enum {
     STACK_H = 0,
     STACK_V = 1,
@@ -57,4 +61,6 @@ static int stack_init(AVFilterContext *avctx);
 static av_cold void stack_uninit(AVFilterContext *avctx);
 static int stack_activate(AVFilterContext *avctx);
 
+#endif
+
 #endif /* AVFILTER_STACK_INTERNAL_H */