diff --git a/libs/numeric/ublas/test/test_complex_norms.cpp b/libs/numeric/ublas/test/test_complex_norms.cpp
index 041972a..f4b1376 100644
--- a/libs/numeric/ublas/test/test_complex_norms.cpp
+++ b/libs/numeric/ublas/test/test_complex_norms.cpp
@@ -34,7 +34,7 @@ BOOST_UBLAS_TEST_DEF ( test_double_complex_norm_2 ) {
     for (unsigned int i = 0; i < v.size(); ++i)
         v[i] = dComplex(i, i + 1);
 
-    const double expected = sqrt(44.0);
+    const double expected = std::sqrt(44.0);
 
     BOOST_UBLAS_DEBUG_TRACE( "norm is " << norm_2(v) );
     BOOST_UBLAS_TEST_CHECK(std::abs(norm_2(v) - expected) < TOL);
@@ -62,7 +62,7 @@ BOOST_UBLAS_TEST_DEF ( test_float_complex_norm_2 ) {
     for (unsigned int i = 0; i < v.size(); ++i)
         v[i] = dComplex(i, i + 1);
 
-    const float expected = sqrt(44.0);
+    const float expected = std::sqrt(44.0);
 
     BOOST_UBLAS_DEBUG_TRACE( "norm is " << norm_2(v) );
     BOOST_UBLAS_TEST_CHECK(std::abs(norm_2(v) - expected) < TOL);