diff --git a/polymake.spec b/polymake.spec
index 1e3293d..da03d5d 100644
--- a/polymake.spec
+++ b/polymake.spec
@@ -58,6 +58,7 @@ BuildRequires:  lrslib-devel
 BuildRequires:  mpfr-devel
 BuildRequires:	perl(ExtUtils::Embed)
 BuildRequires:  perl(ExtUtils::MakeMaker)
+BuildRequires:  perl(Math::Trig)
 BuildRequires:  perl(Term::ReadLine::Gnu)
 BuildRequires:  perl(XML::LibXSLT)
 BuildRequires:  perl(XML::SAX::Base)