diff --git a/main.c b/main.c
index ba90757..e977dff 100644
--- a/main.c
+++ b/main.c
@@ -24,7 +24,7 @@
 
 void Init_LEDs (void) {
   /* Enable clock for PORT B module */
-  SIM_SCGC4 |= SIM_SCGC5_PORTB_MASK;
+  SIM_SCGC5 |= SIM_SCGC5_PORTB_MASK;
 
   /* Select PORT B Pin 8 for GPIO to red LED */
   PORTB_PCR(POS_RED) = PORT_PCR_SET_GPIO;
diff --git a/sysinit.c b/sysinit.c
index 4d3f406..269081d 100644
--- a/sysinit.c
+++ b/sysinit.c
@@ -19,14 +19,14 @@ void SystemInit()
     OSC0_CR = OSC_CR_ERCLKEN_MASK; // external ref clock
     MCG_C1 = MCG_C1_IRCLKEN_MASK;
 
-    while (MCG_S & MCG_S_OSCINIT0_MASK); // wait for osc to become stable
-    while (!(MCG_S & MCG_S_IREFST_MASK)); // wait for FLL and external clock to match
+    while (!(MCG_S & MCG_S_OSCINIT0_MASK)); // wait for osc to become stable
+    while (MCG_S & MCG_S_IREFST_MASK); // wait for FLL and external clock to match
 
     // preserve FCTRIM and SCFTRIM
     MCG_C4 = ((MCG_C4 & -MCG_C4_DRST_DRS_MASK) | MCG_C4_DC0_25PMAX_MID);
 
     // wait for output of FLL to be selected
-    while (!(MCG_S & MCG_S_CLKST_MASK));
+    while (MCG_S & MCG_S_CLKST_MASK);
 
     /****************************/
 }