diff --git a/fmprb_poly/div_series.c b/fmprb_poly/div_series.c
index d8aa4036..5db5323b 100644
--- a/fmprb_poly/div_series.c
+++ b/fmprb_poly/div_series.c
@@ -25,12 +25,6 @@
 
 #include "fmprb_poly.h"
 
-#define MULLOW(z, x, xn, y, yn, nn, prec) \
-    if ((xn) >= (yn)) \
-        _fmprb_poly_mullow(z, x, xn, y, yn, nn, prec); \
-    else \
-        _fmprb_poly_mullow(z, y, yn, x, xn, nn, prec); \
-
 void 
 _fmprb_poly_div_series(fmprb_ptr Q, fmprb_srcptr A, long Alen,
     fmprb_srcptr B, long Blen, long n, long prec)
@@ -48,7 +42,7 @@ _fmprb_poly_div_series(fmprb_ptr Q, fmprb_srcptr A, long Alen,
         fmprb_ptr Binv;
         Binv = _fmprb_vec_init(n);
         _fmprb_poly_inv_series(Binv, B, Blen, n, prec);
-        MULLOW(Q, A, Alen, Binv, n, n, prec);
+        _fmprb_poly_mullow(Q, Binv, n, A, Alen, n, prec);
         _fmprb_vec_clear(Binv, n);
     }
 }