diff --git a/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL05Z/system_MKL05Z4.c b/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL05Z/system_MKL05Z4.c
index 4d11ed65a9..012d472a71 100644
--- a/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL05Z/system_MKL05Z4.c
+++ b/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL05Z/system_MKL05Z4.c
@@ -145,8 +145,8 @@ void SystemInit (void) {
   /* Switch to FEE Mode */
   /* MCG->C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
   MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_EREFS0_MASK);
-  /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
-  OSC0->CR = OSC_CR_ERCLKEN_MASK;
+  /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=1,SC8P=1,SC16P=0 */
+  OSC0->CR = OSC_CR_ERCLKEN_MASK | OSC_CR_SC8P_MASK | OSC_CR_SC4P_MASK;
   /* MCG->C1: CLKS=0,FRDIV=0,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
   MCG->C1 = (MCG_C1_CLKS(0x00) | MCG_C1_FRDIV(0x00) | MCG_C1_IRCLKEN_MASK);
   /* MCG->C4: DMX32=1,DRST_DRS=1 */