diff --git a/target-m68k/translate.c b/target-m68k/translate.c
index 9734d05ecd04a537f617a3b399e909ca02dec05a..a6aaf5ea642ba8b9d842fa778d048b44a2401f86 100644
--- a/target-m68k/translate.c
+++ b/target-m68k/translate.c
@@ -1989,19 +1989,21 @@ DISAS_INSN(or)
     TCGv dest;
     TCGv src;
     TCGv addr;
+    int opsize;
 
-    reg = DREG(insn, 9);
+    opsize = insn_opsize(insn);
+    reg = gen_extend(DREG(insn, 9), opsize, 0);
     dest = tcg_temp_new();
     if (insn & 0x100) {
-        SRC_EA(env, src, OS_LONG, 0, &addr);
+        SRC_EA(env, src, opsize, 0, &addr);
         tcg_gen_or_i32(dest, src, reg);
-        DEST_EA(env, insn, OS_LONG, dest, &addr);
+        DEST_EA(env, insn, opsize, dest, &addr);
     } else {
-        SRC_EA(env, src, OS_LONG, 0, NULL);
+        SRC_EA(env, src, opsize, 0, NULL);
         tcg_gen_or_i32(dest, src, reg);
-        tcg_gen_mov_i32(reg, dest);
+        gen_partset_reg(opsize, DREG(insn, 9), dest);
     }
-    gen_logic_cc(s, dest, OS_LONG);
+    gen_logic_cc(s, dest, opsize);
 }
 
 DISAS_INSN(suba)