diff --git a/sympy.spec b/sympy.spec
index ebb77bc..9d46f1d 100644
--- a/sympy.spec
+++ b/sympy.spec
@@ -15,6 +15,7 @@ BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildArch:      noarch
 BuildRequires:  python-devel
+BuildRequires:  python-mpmath
 Requires:       python-mpmath