diff --git a/fmprb_poly.h b/fmprb_poly.h
index b72728ba..b07a28c1 100644
--- a/fmprb_poly.h
+++ b/fmprb_poly.h
@@ -101,6 +101,8 @@ fmprb_poly_set_fmprb(fmprb_poly_t poly, const fmprb_t c)
     _fmprb_poly_set_length(poly, !fmprb_is_zero(poly->coeffs));
 }
 
+void fmprb_poly_set_si(fmprb_poly_t poly, long c);
+
 /* Comparisons */
 
 int fmprb_poly_contains_fmpq_poly(const fmprb_poly_t poly1, const fmpq_poly_t poly2);
diff --git a/fmprb_poly/set_si.c b/fmprb_poly/set_si.c
new file mode 100644
index 00000000..5cb89372
--- /dev/null
+++ b/fmprb_poly/set_si.c
@@ -0,0 +1,42 @@
+/*=============================================================================
+
+    This file is part of ARB.
+
+    ARB is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    ARB is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with ARB; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+=============================================================================*/
+/******************************************************************************
+
+    Copyright (C) 2012 Fredrik Johansson
+
+******************************************************************************/
+
+#include "fmprb_poly.h"
+
+void
+fmprb_poly_set_si(fmprb_poly_t poly, long c)
+{
+    if (c == 0)
+    {
+        fmprb_poly_zero(poly);
+    }
+    else
+    {
+        fmprb_poly_fit_length(poly, 1);
+        fmprb_set_si(poly->coeffs, c);
+        _fmprb_poly_set_length(poly, 1);
+    }
+}
+