diff --git a/src/CalcManager/CEngine/Rational.cpp b/src/CalcManager/CEngine/Rational.cpp
index 93e080e1..90ea0117 100644
--- a/src/CalcManager/CEngine/Rational.cpp
+++ b/src/CalcManager/CEngine/Rational.cpp
@@ -5,7 +5,6 @@
 #include "Header Files/scimath.h"
 
 using namespace std;
-using namespace CalcEngine::RationalMath;
 
 namespace CalcEngine
 {
diff --git a/src/CalcManager/CEngine/scicomm.cpp b/src/CalcManager/CEngine/scicomm.cpp
index c5995a6e..9871cf23 100644
--- a/src/CalcManager/CEngine/scicomm.cpp
+++ b/src/CalcManager/CEngine/scicomm.cpp
@@ -25,7 +25,6 @@
 
 using namespace std;
 using namespace CalcEngine;
-using namespace CalcEngine::RationalMath;
 
 // NPrecedenceOfOp
 //
diff --git a/src/CalcManager/CEngine/scidisp.cpp b/src/CalcManager/CEngine/scidisp.cpp
index d64ca708..d43ef3da 100644
--- a/src/CalcManager/CEngine/scidisp.cpp
+++ b/src/CalcManager/CEngine/scidisp.cpp
@@ -66,7 +66,7 @@ CalcEngine::Rational CCalcEngine::TruncateNumForIntMath(CalcEngine::Rational con
         // if negative make positive by doing a twos complement
         result = result.Negate();
         result = result.Sub(1, m_precision);
-        result = result.Not(true, m_chopNumbers[m_numwidth], m_radix, m_precision);
+        result = result.Not(true /* IntegerMode */, m_chopNumbers[m_numwidth], m_radix, m_precision);
     }
 
     result = result.And(m_chopNumbers[m_numwidth], m_radix, m_precision);