diff --git a/include/arm.h b/include/arm.h
index d04a3b0..a966697 100644
--- a/include/arm.h
+++ b/include/arm.h
@@ -197,7 +197,7 @@
 static inline u32 __getCpsr(void)
 {
 	u32 cpsr;
-	__asm__("mrs %0, cpsr" : "=r" (cpsr) : );
+	__asm__ volatile("mrs %0, cpsr" : "=r" (cpsr) : );
 	return cpsr;
 }