diff --git a/src/flash/nor/kinetis.c b/src/flash/nor/kinetis.c
index 61e7b17ab..239cf4164 100644
--- a/src/flash/nor/kinetis.c
+++ b/src/flash/nor/kinetis.c
@@ -948,7 +948,7 @@ static int kinetis_create_missing_banks(struct kinetis_chip *k_chip)
 	unsigned num_blocks;
 	struct kinetis_flash_bank *k_bank;
 	struct flash_bank *bank;
-	char base_name[69], name[80], num[4];
+	char base_name[69], name[87], num[11];
 	char *class, *p;
 
 	num_blocks = k_chip->num_pflash_blocks + k_chip->num_nvm_blocks;