diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c
index 41b14344b16f..817cb10a8e79 100644
--- a/drivers/resctrl/mpam_devices.c
+++ b/drivers/resctrl/mpam_devices.c
@@ -731,7 +731,7 @@ static void mpam_enable_quirks(struct mpam_msc *msc)
 static bool _mpam_ris_hw_probe_hw_nrdy(struct mpam_msc_ris *ris, u32 mon_reg)
 {
 	u32 now;
-	u64 mon_sel;
+	u32 mon_sel;
 	bool can_set, can_clear;
 	struct mpam_msc *msc = ris->vmsc->msc;
 
@@ -740,7 +740,7 @@ static bool _mpam_ris_hw_probe_hw_nrdy(struct mpam_msc_ris *ris, u32 mon_reg)
 
 	mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, 0) |
 		  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
-	_mpam_write_monsel_reg(msc, mon_reg, mon_sel);
+	mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
 
 	_mpam_write_monsel_reg(msc, mon_reg, MSMON___NRDY);
 	now = _mpam_read_monsel_reg(msc, mon_reg);