diff --git a/Code/Mantid/Framework/API/inc/MantidAPI/NumericAxis.h b/Code/Mantid/Framework/API/inc/MantidAPI/NumericAxis.h
index bb086a5c3694..47fdb2b72dbc 100644
--- a/Code/Mantid/Framework/API/inc/MantidAPI/NumericAxis.h
+++ b/Code/Mantid/Framework/API/inc/MantidAPI/NumericAxis.h
@@ -66,7 +66,7 @@ class MANTID_API_DLL NumericAxis : public Axis {
   size_t indexOfValue(const double value) const;
   virtual bool operator==(const Axis &) const;
   virtual bool equalWithinTolerance(const Axis &axis2,
-                                    const double tolerance = 0.0) const;
+                                    const double tolerance) const;
   std::string label(const std::size_t &index) const;
   /// Create bin boundaries from the point values
   virtual std::vector<double> createBinBoundaries() const;
diff --git a/Code/Mantid/Framework/API/inc/MantidAPI/RefAxis.h b/Code/Mantid/Framework/API/inc/MantidAPI/RefAxis.h
index b4e442d68cee..09307005f23e 100644
--- a/Code/Mantid/Framework/API/inc/MantidAPI/RefAxis.h
+++ b/Code/Mantid/Framework/API/inc/MantidAPI/RefAxis.h
@@ -55,7 +55,7 @@ class MANTID_API_DLL RefAxis : public NumericAxis {
   virtual void setValue(const std::size_t &index, const double &value);
   virtual bool operator==(const Axis &) const;
   virtual bool equalWithinTolerance(const Axis &axis2,
-                                    const double tolerance = 0.0) const;
+                                    const double tolerance) const;
   virtual double getMin() const;
   virtual double getMax() const;