diff --git a/plat/imx/imx8m/imx8mq/gpc.c b/plat/imx/imx8m/imx8mq/gpc.c
index c036e13..0a029d6 100644
--- a/plat/imx/imx8m/imx8mq/gpc.c
+++ b/plat/imx/imx8m/imx8mq/gpc.c
@@ -261,7 +261,7 @@
 		mmio_setbits_32(IMX_GPC_BASE + SLTx_CFG(2), SLT_COREx_PUP(last_core));
 		/* ACK setting: PLAT ACK for PDN, CORE ACK for PUP */
 		mmio_clrsetbits_32(IMX_GPC_BASE + PGC_ACK_SEL_A53, 0xFFFFFFFF,
-			A53_PLAT_PDN_ACK | A53_PLAT_PUP_ACK);
+			A53_PLAT_PDN_ACK | SLT_COREx_PUP_ACK(last_core));
 	} else {
 		mmio_clrbits_32(IMX_GPC_BASE + SLTx_CFG(0), 0xFFFFFFFF);
 		mmio_clrbits_32(IMX_GPC_BASE + SLTx_CFG(1), 0xFFFFFFFF);
diff --git a/plat/imx/imx8m/include/gpc.h b/plat/imx/imx8m/include/gpc.h
index e5af4b4..eb33abd 100644
--- a/plat/imx/imx8m/include/gpc.h
+++ b/plat/imx/imx8m/include/gpc.h
@@ -24,6 +24,7 @@
 #define COREx_LPM_PUP(core_id)		((core_id) < 2 ? (1 << ((core_id) * 2 + 9)) : (1 << ((core_id) * 2 + 21)))
 #define SLTx_CFG(n)			((SLT0_CFG + ((n) * 4)))
 #define SLT_COREx_PUP(core_id)		(0x2 << ((core_id) * 2))
+#define SLT_COREx_PUP_ACK(core_id)	((core_id) < 2 ? (1 << ((core_id) + 16)) : (1 << ((core_id) + 27)))
 
 #define IMR_MASK_ALL	0xffffffff