diff --git a/source/arm11/hardware/interrupt.c b/source/arm11/hardware/interrupt.c
index 844009a..3a21074 100644
--- a/source/arm11/hardware/interrupt.c
+++ b/source/arm11/hardware/interrupt.c
@@ -133,7 +133,7 @@
 	const u32 cpuId = getCpuId();
 	if(!cpuMask) cpuMask = 1u<<cpuId;
 
-	u32 oldState = enterCriticalSection();
+	const u32 oldState = enterCriticalSection();
 
 	if(handler)
 	{
@@ -160,7 +160,7 @@
 
 void IRQ_unregisterHandler(Interrupt id)
 {
-	u32 oldState = enterCriticalSection();
+	const u32 oldState = enterCriticalSection();
 
 	REGs_GID_ENA_CLR[id>>5] = 1u<<(id % 32);
 
@@ -172,7 +172,7 @@
 
 void IRQ_setPriority(Interrupt id, u8 prio)
 {
-	u32 oldState = enterCriticalSection();
+	const u32 oldState = enterCriticalSection();
 
 	u32 shift = (id % 4 * 8) + 4;
 	u32 tmp = REGs_GID_IPRIO[id>>2] & ~(0xFu<<shift);