diff --git a/gcc/builtins.cc b/gcc/builtins.cc
index 38b0acff131249579c39d397e40107deddef56b8..12a535d313f12c574042275dd0550114df74bb48 100644
--- a/gcc/builtins.cc
+++ b/gcc/builtins.cc
@@ -4519,7 +4519,7 @@ try_store_by_multiple_pieces (rtx to, rtx len, unsigned int ctz_len,
 	  to = change_address (to, QImode, 0);
 	  emit_move_insn (to, val);
 	  if (update_needed)
-	    next_ptr = plus_constant (ptr_mode, ptr, blksize);
+	    next_ptr = plus_constant (GET_MODE (ptr), ptr, blksize);
 	}
       else
 	{
diff --git a/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c b/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c
new file mode 100644
index 0000000000000000000000000000000000000000..fe8414559864db4a8584fd3f5a7145b5e3d1f322
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/inline-mem-set-pr112804.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-options "-finline-stringops -mabi=ilp32 -ftrivial-auto-var-init=zero" } */
+
+short m(unsigned k) {
+  const unsigned short *n[65];
+  return 0;
+}