diff --git a/src/target/arm_adi_v5.h b/src/target/arm_adi_v5.h
index 17365bddb..ea7155167 100644
--- a/src/target/arm_adi_v5.h
+++ b/src/target/arm_adi_v5.h
@@ -253,7 +253,7 @@ struct adiv5_dap {
 	/* Control config */
 	uint32_t dp_ctrl_stat;
 
-	struct adiv5_ap ap[256];
+	struct adiv5_ap ap[DP_APSEL_MAX + 1];
 
 	/* The current manually selected AP by the "dap apsel" command */
 	uint32_t apsel;