diff --git a/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_enet.c b/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_enet.c
index a98d0b7be0..91073bcd6a 100644
--- a/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_enet.c
+++ b/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_K66F/drivers/fsl_enet.c
@@ -1064,11 +1064,11 @@ void ENET_AddMulticastGroup(ENET_Type *base, uint8_t *address)
     /* Enable a multicast group address. */
     if (!((crc >> 0x1FU) & 1U))
     {
-        base->GALR = 1U << ((crc >> 0x1AU) & 0x1FU);
+        base->GALR |= 1U << ((crc >> 0x1AU) & 0x1FU);
     }
     else
     {
-        base->GAUR = 1U << ((crc >> 0x1AU) & 0x1FU);
+        base->GAUR |= 1U << ((crc >> 0x1AU) & 0x1FU);
     }
 }
 
diff --git a/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/drivers/fsl_enet.c b/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/drivers/fsl_enet.c
index 7f15c05183..85d3ca9ccd 100755
--- a/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/drivers/fsl_enet.c
+++ b/hal/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/drivers/fsl_enet.c
@@ -1064,11 +1064,11 @@ void ENET_AddMulticastGroup(ENET_Type *base, uint8_t *address)
     /* Enable a multicast group address. */
     if (!((crc >> 0x1FU) & 1U))
     {
-        base->GALR = 1U << ((crc >> 0x1AU) & 0x1FU);
+        base->GALR |= 1U << ((crc >> 0x1AU) & 0x1FU);
     }
     else
     {
-        base->GAUR = 1U << ((crc >> 0x1AU) & 0x1FU);
+        base->GAUR |= 1U << ((crc >> 0x1AU) & 0x1FU);
     }
 }