diff --git a/EInAPI.h b/EInAPI.h
index 7ee721c..247a5cc 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -581,7 +581,7 @@ EIN_EXPORT BOOL __stdcall EgtSetMachiningParamDouble( int nType, double dVal) ;
 EIN_EXPORT BOOL __stdcall EgtPreviewMachining( BOOL bRecalc) ;
 EIN_EXPORT BOOL __stdcall EgtGetMachiningParamInt( int nType, int* pnVal) ;
 EIN_EXPORT BOOL __stdcall EgtGetMachiningParamDouble( int nType, double* pdVal) ;
-EIN_EXPORT BOOL __stdcall EgtIsMachiningNotEmpty( void) ;
+EIN_EXPORT BOOL __stdcall EgtIsMachiningEmpty( void) ;
 // Simulation
 EIN_EXPORT BOOL __stdcall EgtSimStart( void) ;
 EIN_EXPORT BOOL __stdcall EgtSimMove( int* pnStatus) ;
diff --git a/EMkMachMgr.h b/EMkMachMgr.h
index 725f2ea..08c3efc 100644
--- a/EMkMachMgr.h
+++ b/EMkMachMgr.h
@@ -162,7 +162,7 @@ class __declspec( novtable) IMachMgr
       virtual bool GetMachiningParam( int nType, double& dVal) const = 0 ;
       virtual bool GetMachiningParam( int nType, std::string& sVal) const = 0 ;
       virtual bool GetMachiningGeometry( SELVECTOR& vIds) const = 0 ;
-      virtual bool IsNotEmpty( void) const = 0 ;
+      virtual bool IsEmpty( void) const = 0 ;
      // Simulation
       virtual bool SimStart( void) = 0 ;
       virtual bool SimMove( int& nStatus) = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index c76ef03..95ec782 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -632,7 +632,7 @@ EXE_EXPORT bool ExeGetMachiningParam( int nType, int& nVal) ;
 EXE_EXPORT bool ExeGetMachiningParam( int nType, double& dVal) ;
 EXE_EXPORT bool ExeGetMachiningParam( int nType, std::string& sVal) ;
 EXE_EXPORT bool ExeGetMachiningGeometry( SELVECTOR& vIds) ;
-EXE_EXPORT bool ExeIsMachiningNotEmpty( void) ;
+EXE_EXPORT bool ExeIsMachiningEmpty( void) ;
 // Simulation
 EXE_EXPORT bool ExeSimStart( void) ;
 EXE_EXPORT bool ExeSimMove( int& nStatus) ;