diff --git a/libavcodec/atrac9tab.h b/libavcodec/atrac9tab.h
index c25d0e2744..4e0c3ee1cc 100644
--- a/libavcodec/atrac9tab.h
+++ b/libavcodec/atrac9tab.h
@@ -104,7 +104,7 @@ static const int at9_q_unit_to_coeff_idx[] = {
     72, 80, 88, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256
 };
 
-const uint8_t at9_q_unit_to_codebookidx[] = {
+static const uint8_t at9_q_unit_to_codebookidx[] = {
     0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
     2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
 };