diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b3601c0..f7493697 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 * Slideshow timer resets when next is pressed
 * Changed modlist extension to `.wabbajack`
 * You can now open modlists directly (after initial launch)
+* Wabbajack will exit if MO2 is running
 
 #### Version 1.0 alpha 2 - 10/15/2019
 * Fix installer running in wrong mode
diff --git a/Wabbajack.Common/Utils.cs b/Wabbajack.Common/Utils.cs
index 4928b117..3c8a448c 100644
--- a/Wabbajack.Common/Utils.cs
+++ b/Wabbajack.Common/Utils.cs
@@ -26,6 +26,12 @@ namespace Wabbajack.Common
 {
     public static class Utils
     {
+        public static bool IsMO2Running(string mo2Path)
+        {
+            Process[] processList = Process.GetProcesses();
+            return processList.Where(process => process.ProcessName == "ModOrganizer").Any(process => Path.GetDirectoryName(process.MainModule?.FileName) == mo2Path);
+        }
+
         public static string LogFile { get; private set; }
         static Utils()
         {
diff --git a/Wabbajack/AppState.cs b/Wabbajack/AppState.cs
index 9eea5bb0..ff590923 100644
--- a/Wabbajack/AppState.cs
+++ b/Wabbajack/AppState.cs
@@ -280,6 +280,13 @@ namespace Wabbajack
             this.ModListName = profile_name;
             this.Mode = RunMode.Compile;
 
+            if (Utils.IsMO2Running(mo2folder))
+            {
+                MessageBox.Show("You need to close MO2 before running Wabbajack!",
+                    "Error", MessageBoxButton.OK);
+                Environment.Exit(1);
+            }
+
             var tmp_compiler = new Compiler(mo2folder);
             DownloadLocation = tmp_compiler.MO2DownloadsFolder;