diff --git a/include/codebooks.h b/include/codebooks.h
index d113770..a2d555f 100644
--- a/include/codebooks.h
+++ b/include/codebooks.h
@@ -33,7 +33,7 @@ extern word16_t MAPredictorSum[L0_RANGE][NB_LSP_COEFF]; /* 1 - Sum(MAPredictor)
 extern word16_t invMAPredictorSum[L0_RANGE][NB_LSP_COEFF]; /* 1/(1 - Sum(MAPredictor)) in Q3.12 */
 
 /* codebook for adaptative code vector */
-extern word16_t b30[30];
+extern word16_t b30[31];
 
 /* codebook for gains */
 extern uint16_t reverseIndexMappingGA[8];