diff --git a/src/CalcManager/CEngine/Rational.cpp b/src/CalcManager/CEngine/Rational.cpp
index 8cfbab0d..be2ac576 100644
--- a/src/CalcManager/CEngine/Rational.cpp
+++ b/src/CalcManager/CEngine/Rational.cpp
@@ -378,12 +378,7 @@ namespace CalcEngine
         lhs ^= rhs;
         return lhs;
     }
-
-    bool Rational::IsZero() const
-    {
-        return this->P().IsZero();
-    }
-
+    
     bool operator==(Rational const& lhs, Rational const& rhs)
     {
         PRAT lhsRat = lhs.ToPRAT();
@@ -450,6 +445,11 @@ namespace CalcEngine
         return !(lhs < rhs);
     }
 
+    bool Rational::IsZero() const
+    {
+        return this->P().IsZero();
+    }
+
     wstring Rational::ToString(uint32_t radix, NUMOBJ_FMT fmt, int32_t precision) const
     {
         PRAT rat = this->ToPRAT();
diff --git a/src/CalcManager/Header Files/Rational.h b/src/CalcManager/Header Files/Rational.h
index 0620f498..cd49d63e 100644
--- a/src/CalcManager/Header Files/Rational.h	
+++ b/src/CalcManager/Header Files/Rational.h	
@@ -56,8 +56,6 @@ namespace CalcEngine
         friend Rational operator|(Rational lhs, Rational const& rhs);
         friend Rational operator^(Rational lhs, Rational const& rhs);
 
-        bool IsZero() const;
-
         friend bool operator==(Rational const& lhs, Rational const& rhs);
         friend bool operator!=(Rational const& lhs, Rational const& rhs);
         friend bool operator<(Rational const& lhs, Rational const& rhs);
@@ -65,6 +63,7 @@ namespace CalcEngine
         friend bool operator<=(Rational const& lhs, Rational const& rhs);
         friend bool operator>=(Rational const& lhs, Rational const& rhs);
 
+        bool IsZero() const;
         std::wstring ToString(uint32_t radix, NUMOBJ_FMT format, int32_t precision) const;
         uint64_t ToUInt64_t() const;