diff --git a/insns.def b/insns.def
index 72ce1d998f..506bbe21a7 100644
--- a/insns.def
+++ b/insns.def
@@ -1431,29 +1431,24 @@ opt_mult
     if (FIXNUM_2_P(recv, obj) &&
 	BASIC_OP_UNREDEFINED_P(BOP_MULT, FIXNUM_REDEFINED_OP_FLAG)) {
 	long a = FIX2LONG(recv);
-	if (a == 0) {
-	    val = recv;
+#ifdef HAVE_INT128_T
+	VALUE rb_int128t2big(int128_t n);
+	int128_t r = (int128_t)a * (int128_t)FIX2LONG(obj);
+	if (RB_FIXABLE(r)) {
+		val = LONG2FIX((long)r);
 	}
 	else {
-#ifdef HAVE_INT128_T
-	    VALUE rb_int128t2big(int128_t n);
-	    int128_t r = (int128_t)a * FIX2LONG(obj);
-	    if (RB_FIXABLE(r)) {
-		val = LONG2FIX((long)r);
-	    }
-	    else {
 		val = rb_int128t2big(r);
-	    }
-#else
-	    long b = FIX2LONG(obj);
-	    if (MUL_OVERFLOW_FIXNUM_P(a, b)) {
-		val = rb_big_mul(rb_int2big(a), rb_int2big(b));
-	    }
-	    else {
-		val = LONG2FIX(a * b);
-	    }
-#endif
 	}
+#else
+	long b = FIX2LONG(obj);
+	if (MUL_OVERFLOW_FIXNUM_P(a, b)) {
+		val = rb_big_mul(rb_int2big(a), rb_int2big(b));
+	}
+	else {
+		val = LONG2FIX(a * b);
+	}
+#endif
     }
     else if (FLONUM_2_P(recv, obj) &&
 	     BASIC_OP_UNREDEFINED_P(BOP_MULT, FLOAT_REDEFINED_OP_FLAG)) {