diff --git a/Ink Canvas/Helpers/MultiPPTInkManager.cs b/Ink Canvas/Helpers/MultiPPTInkManager.cs
index 64d99620..ec30d31d 100644
--- a/Ink Canvas/Helpers/MultiPPTInkManager.cs	
+++ b/Ink Canvas/Helpers/MultiPPTInkManager.cs	
@@ -561,7 +561,7 @@ namespace Ink_Canvas.Helpers
                 var presentationPath = presentation.FullName;
                 var fileHash = GetFileHash(presentationPath);
                 var processId = GetProcessId(presentation);
-                return $"{presentation.Name}_{fileHash}_{processId}";
+                return $"{presentation.Name}_{presentation.Slides.Count}_{fileHash}_{processId}";
             }
             catch (COMException comEx)
             {
diff --git a/Ink Canvas/Helpers/PPTInkManager.cs b/Ink Canvas/Helpers/PPTInkManager.cs
index 0776e827..93b0a4dc 100644
--- a/Ink Canvas/Helpers/PPTInkManager.cs	
+++ b/Ink Canvas/Helpers/PPTInkManager.cs	
@@ -456,7 +456,7 @@ namespace Ink_Canvas.Helpers
             {
                 var presentationPath = presentation.FullName;
                 var fileHash = GetFileHash(presentationPath);
-                return $"{presentation.Name}_{fileHash}";
+                return $"{presentation.Name}_{presentation.Slides.Count}_{fileHash}";
             }
             catch (Exception ex)
             {