diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index b99bb2369fff..d80054470909 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -852,7 +852,7 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 		if (!d->config_buf)
 			goto err_alloc;
 
-		for (i = 0; i < chip->num_config_regs; i++) {
+		for (i = 0; i < chip->num_config_bases; i++) {
 			d->config_buf[i] = kcalloc(chip->num_config_regs,
 						   sizeof(**d->config_buf),
 						   GFP_KERNEL);