diff --git a/OpenRA.Platforms.Default/MultiTapDetection.cs b/OpenRA.Platforms.Default/MultiTapDetection.cs
index 1031afaa11..0f783bf89d 100644
--- a/OpenRA.Platforms.Default/MultiTapDetection.cs
+++ b/OpenRA.Platforms.Default/MultiTapDetection.cs
@@ -16,8 +16,8 @@ namespace OpenRA.Platforms.Default
 {
 	static class MultiTapDetection
 	{
-		static Cache<Keycode, TapHistory> keyHistoryCache =
-			new Cache<Keycode, TapHistory>(_ => new TapHistory(DateTime.Now - TimeSpan.FromSeconds(1)));
+		static Cache<Pair<Keycode, Modifiers>, TapHistory> keyHistoryCache =
+			new Cache<Pair<Keycode, Modifiers>, TapHistory>(_ => new TapHistory(DateTime.Now - TimeSpan.FromSeconds(1)));
 		static Cache<byte, TapHistory> clickHistoryCache =
 			new Cache<byte, TapHistory>(_ => new TapHistory(DateTime.Now - TimeSpan.FromSeconds(1)));
 
@@ -31,14 +31,14 @@ namespace OpenRA.Platforms.Default
 			return clickHistoryCache[button].LastTapCount();
 		}
 
-		public static int DetectFromKeyboard(Keycode key)
+		public static int DetectFromKeyboard(Keycode key, Modifiers mods)
 		{
-			return keyHistoryCache[key].GetTapCount(int2.Zero);
+			return keyHistoryCache[Pair.New(key, mods)].GetTapCount(int2.Zero);
 		}
 
-		public static int InfoFromKeyboard(Keycode key)
+		public static int InfoFromKeyboard(Keycode key, Modifiers mods)
 		{
-			return keyHistoryCache[key].LastTapCount();
+			return keyHistoryCache[Pair.New(key, mods)].LastTapCount();
 		}
 	}
 
diff --git a/OpenRA.Platforms.Default/Sdl2Input.cs b/OpenRA.Platforms.Default/Sdl2Input.cs
index 48c26ecd17..4835adbbbf 100644
--- a/OpenRA.Platforms.Default/Sdl2Input.cs
+++ b/OpenRA.Platforms.Default/Sdl2Input.cs
@@ -161,8 +161,8 @@ namespace OpenRA.Platforms.Default
 								KeyInputEvent.Down : KeyInputEvent.Up;
 
 							var tapCount = e.type == SDL.SDL_EventType.SDL_KEYDOWN ?
-								MultiTapDetection.DetectFromKeyboard(keyCode) :
-								MultiTapDetection.InfoFromKeyboard(keyCode);
+								MultiTapDetection.DetectFromKeyboard(keyCode, mods) :
+								MultiTapDetection.InfoFromKeyboard(keyCode, mods);
 
 							var keyEvent = new KeyInput
 							{