diff --git a/numeric.c b/numeric.c
index 7047f9185d..30afc581fe 100644
--- a/numeric.c
+++ b/numeric.c
@@ -3974,8 +3974,10 @@ fix_pow(VALUE x, VALUE y)
 	    else
 		return INT2FIX(-1);
 	}
-	if (b < 0)
-	    return num_funcall1(rb_rational_raw1(x), idPow, y);
+	if (b < 0) {
+	    if (a == 0) rb_num_zerodiv();
+	    return rb_rational_raw(INT2FIX(1), rb_int_pow(x, LONG2NUM(-b)));
+	}
 
 	if (b == 0) return INT2FIX(1);
 	if (b == 1) return x;
@@ -3991,8 +3993,10 @@ fix_pow(VALUE x, VALUE y)
 	    if (int_even_p(y)) return INT2FIX(1);
 	    else return INT2FIX(-1);
 	}
-	if (rb_num_negative_int_p(y))
-	    return num_funcall1(rb_rational_raw1(x), idPow, y);
+	if (BIGNUM_NEGATIVE_P(y)) {
+	    if (a == 0) rb_num_zerodiv();
+	    return rb_rational_raw(INT2FIX(1), rb_int_pow(x, rb_big_uminus(y)));
+	}
 	if (a == 0) return INT2FIX(0);
 	x = rb_int2big(FIX2LONG(x));
 	return rb_big_pow(x, y);