diff --git a/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c b/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
index d0f06790d38f..caaf9e34f1ee 100644
--- a/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
+++ b/drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
@@ -220,7 +220,7 @@ static int rt2880_pinmux_index(struct rt2880_priv *p)
 	/* allocate our function and group mapping index buffers */
 	f = p->func = devm_kcalloc(p->dev,
 				   p->func_count,
-				   sizeof(struct rt2880_pmx_func),
+				   sizeof(*p->func),
 				   GFP_KERNEL);
 	gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
 					GFP_KERNEL);