1 files changed, 2 insertions, 2 deletions
diff --git a/chart2/source/tools/LogarithmicRegressionCurveCalculator.cxx b/chart2/source/tools/LogarithmicRegressionCurveCalculator.cxx
index d164918970ba..3c486411b37f 100644
--- a/chart2/source/tools/LogarithmicRegressionCurveCalculator.cxx
+++ b/chart2/source/tools/LogarithmicRegressionCurveCalculator.cxx
@@ -92,8 +92,8 @@ double SAL_CALL LogarithmicRegressionCurveCalculator::getCurveValue( double x )
     double fResult;
     ::rtl::math::setNan( & fResult );
 
-    if( ! ( ::rtl::math::isNan( m_fSlope ) ||
-            ::rtl::math::isNan( m_fIntercept )))
+    if( ! ( std::isnan( m_fSlope ) ||
+            std::isnan( m_fIntercept )))
     {
         fResult = m_fSlope * log( x ) + m_fIntercept;
     }