diff --git a/target/s390x/mmu_helper.c b/target/s390x/mmu_helper.c
index 0620b1803e..167f1b1455 100644
--- a/target/s390x/mmu_helper.c
+++ b/target/s390x/mmu_helper.c
@@ -125,7 +125,7 @@ static inline bool read_table_entry(CPUS390XState *env, hwaddr gaddr,
 
 static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
                               uint64_t asc, uint64_t asce, target_ulong *raddr,
-                              int *flags, int rw)
+                              int *flags)
 {
     const bool edat1 = (env->cregs[0] & CR0_EDAT) &&
                        s390_has_feat(S390_FEAT_EDAT);
@@ -428,7 +428,7 @@ int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
     }
 
     /* perform the DAT translation */
-    r = mmu_translate_asce(env, vaddr, asc, asce, raddr, flags, rw);
+    r = mmu_translate_asce(env, vaddr, asc, asce, raddr, flags);
     if (unlikely(r)) {
         return r;
     }