diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb5f7c9bc..da4dcc45a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,7 @@
     Bug #4453: Quick keys behaviour is invalid for equipment
     Bug #4454: AI opens doors too slow
     Bug #4457: Item without CanCarry flag prevents shield autoequipping in dark areas
+    Bug #4458: AiWander console command handles idle chances incorrectly
     Feature #4256: Implement ToggleBorders (TB) console command
     Feature #3276: Editor: Search- Show number of (remaining) search results and indicate a search without any results
     Feature #4222: 360° screenshots
diff --git a/apps/openmw/mwscript/aiextensions.cpp b/apps/openmw/mwscript/aiextensions.cpp
index c98e0fc5a..c51a55b50 100644
--- a/apps/openmw/mwscript/aiextensions.cpp
+++ b/apps/openmw/mwscript/aiextensions.cpp
@@ -193,10 +193,18 @@ namespace MWScript
                     Interpreter::Type_Integer time = static_cast<Interpreter::Type_Integer>(runtime[0].mFloat);
                     runtime.pop();
 
+                    // Chance for Idle is unused
+                    if (arg0)
+                    {
+                        --arg0;
+                        runtime.pop();
+                    }
+
                     std::vector<unsigned char> idleList;
                     bool repeat = false;
 
-                    for(int i=1; i < 10 && arg0; ++i)
+                    // Chances for Idle2-Idle9
+                    for(int i=2; i<=9 && arg0; ++i)
                     {
                         if(!repeat)
                             repeat = true;