diff --git a/arch/arm/pthread_arch.h b/arch/arm/pthread_arch.h
index e607c5db..5f96f2b0 100644
--- a/arch/arm/pthread_arch.h
+++ b/arch/arm/pthread_arch.h
@@ -1,4 +1,6 @@
-#define __pthread_self ((pthread_t (*)(void))0xffff0fe0)
+typedef pthread_t (*__pthread_self_func_t)(void) __attribute__((const));
+
+#define __pthread_self ((__pthread_self_func_t)0xffff0fe0)
 
 #define CANCEL_REG_SP 16
 #define CANCEL_REG_IP 18