diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 758c74906a66b3c532f66dc02de14370727156a7..89bf32eb345397714f9ca8b0d2cbd5dd643a4e25 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -515,7 +515,7 @@ static u32 get_mba_granularity(struct mpam_props *cprops)
 		 * bwa_wd is the number of bits implemented in the 0.xxx
 		 * fixed point fraction. 1 bit is 50%, 2 is 25% etc.
 		 */
-		return MAX_MBA_BW / (cprops->bwa_wd + 1);
+		return (MAX_MBA_BW / BIT(cprops->bwa_wd));
 	}
 
 	return 0;