diff --git a/libavcodec/escape124.c b/libavcodec/escape124.c
index 42732eae8c..bf84335180 100644
--- a/libavcodec/escape124.c
+++ b/libavcodec/escape124.c
@@ -37,7 +37,7 @@ typedef union SuperBlock {
 typedef struct CodeBook {
     unsigned depth;
     unsigned size;
-    MacroBlock blocks[];
+    MacroBlock blocks[0];
 } CodeBook;
 
 typedef struct Escape124Context {