diff --git a/test/main.h b/test/main.h
index b0e3b7818..1bfb9e1b0 100644
--- a/test/main.h
+++ b/test/main.h
@@ -302,7 +302,7 @@ namespace Eigen {
 template<typename T> inline typename NumTraits<T>::Real test_precision() { return NumTraits<T>::dummy_precision(); }
 template<> inline float test_precision<float>() { return 1e-3f; }
 template<> inline double test_precision<double>() { return 1e-6; }
-template<> inline long double test_precision<long double>() { return 1e-6; }
+template<> inline long double test_precision<long double>() { return 1e-6l; }
 template<> inline float test_precision<std::complex<float> >() { return test_precision<float>(); }
 template<> inline double test_precision<std::complex<double> >() { return test_precision<double>(); }
 template<> inline long double test_precision<std::complex<long double> >() { return test_precision<long double>(); }