diff --git a/arch/arm64/include/irq.h b/arch/arm64/include/irq.h
index b07bab39b3f..0ca3f5c24e2 100644
--- a/arch/arm64/include/irq.h
+++ b/arch/arm64/include/irq.h
@@ -424,7 +424,7 @@ static inline_function void up_irq_restore(irqstate_t flags)
 
 #define write_sysreg(__val, reg)                    \
   ({                                                \
-    __asm__ volatile ("msr " STRINGIFY(reg) ", %0"  \
+    __asm__ volatile ("msr " STRINGIFY(reg) ", %x0"  \
                       : : "r" (__val) : "memory");  \
   })
 
diff --git a/arch/arm64/src/common/arm64_cache.c b/arch/arm64/src/common/arm64_cache.c
index e5c17ab0b6d..d711bb1581a 100644
--- a/arch/arm64/src/common/arm64_cache.c
+++ b/arch/arm64/src/common/arm64_cache.c
@@ -77,7 +77,7 @@
 
 #define dc_ops(op, val)                                          \
   ({                                                             \
-    __asm__ volatile ("dc " op ", %0" : : "r" (val) : "memory"); \
+    __asm__ volatile ("dc " op ", %x0" : : "r" (val) : "memory"); \
   })
 
 #define ic_ops(op, val)                                          \