diff --git a/sys/riscv/include/atomic.h b/sys/riscv/include/atomic.h
--- a/sys/riscv/include/atomic.h
+++ b/sys/riscv/include/atomic.h
@@ -569,7 +569,7 @@
 ATOMIC_FCMPSET_ACQ_REL(64);
 
 static __inline uint64_t
-atomic_load_acq_64(volatile uint64_t *p)
+atomic_load_acq_64(const volatile uint64_t *p)
 {
 	uint64_t ret;