diff --git a/Source/Core/Core/Movie.cpp b/Source/Core/Core/Movie.cpp
index 5b66b707ea..6d9f3b4c8d 100644
--- a/Source/Core/Core/Movie.cpp
+++ b/Source/Core/Core/Movie.cpp
@@ -715,8 +715,8 @@ static void SetInputDisplayString(ControllerState padState, int controllerID)
 }
 
 // NOTE: CPU Thread
-static void SetWiiInputDisplayString(int remoteID, const DataReportBuilder& rpt, int ext,
-                                     const EncryptionKey& key)
+static void SetWiiInputDisplayString(int remoteID, const DataReportBuilder& rpt,
+                                     ExtensionNumber ext, const EncryptionKey& key)
 {
   int controllerID = remoteID + 4;
 
@@ -897,7 +897,7 @@ void RecordInput(const GCPadStatus* PadStatus, int controllerID)
 }
 
 // NOTE: CPU Thread
-void CheckWiimoteStatus(int wiimote, const DataReportBuilder& rpt, int ext,
+void CheckWiimoteStatus(int wiimote, const DataReportBuilder& rpt, ExtensionNumber ext,
                         const EncryptionKey& key)
 {
   SetWiiInputDisplayString(wiimote, rpt, ext, key);
@@ -1297,7 +1297,7 @@ void PlayController(GCPadStatus* PadStatus, int controllerID)
 }
 
 // NOTE: CPU Thread
-bool PlayWiimote(int wiimote, WiimoteCommon::DataReportBuilder& rpt, int ext,
+bool PlayWiimote(int wiimote, WiimoteCommon::DataReportBuilder& rpt, ExtensionNumber ext,
                  const EncryptionKey& key)
 {
   if (!IsPlayingInput() || !IsUsingWiimote(wiimote) || s_temp_input.empty())
diff --git a/Source/Core/Core/Movie.h b/Source/Core/Core/Movie.h
index e5cc13f2bf..8bd00db823 100644
--- a/Source/Core/Core/Movie.h
+++ b/Source/Core/Core/Movie.h
@@ -29,7 +29,8 @@ class DataReportBuilder;
 namespace WiimoteEmu
 {
 class EncryptionKey;
-}
+enum ExtensionNumber : u8;
+}  // namespace WiimoteEmu
 
 // Per-(video )Movie actions
 
@@ -185,15 +186,15 @@ bool PlayInput(const std::string& movie_path, std::optional<std::string>* savest
 void LoadInput(const std::string& movie_path);
 void ReadHeader();
 void PlayController(GCPadStatus* PadStatus, int controllerID);
-bool PlayWiimote(int wiimote, WiimoteCommon::DataReportBuilder& rpt, int ext,
-                 const WiimoteEmu::EncryptionKey& key);
+bool PlayWiimote(int wiimote, WiimoteCommon::DataReportBuilder& rpt,
+                 WiimoteEmu::ExtensionNumber ext, const WiimoteEmu::EncryptionKey& key);
 void EndPlayInput(bool cont);
 void SaveRecording(const std::string& filename);
 void DoState(PointerWrap& p);
 void Shutdown();
 void CheckPadStatus(const GCPadStatus* PadStatus, int controllerID);
-void CheckWiimoteStatus(int wiimote, const WiimoteCommon::DataReportBuilder& rpt, int ext,
-                        const WiimoteEmu::EncryptionKey& key);
+void CheckWiimoteStatus(int wiimote, const WiimoteCommon::DataReportBuilder& rpt,
+                        WiimoteEmu::ExtensionNumber ext, const WiimoteEmu::EncryptionKey& key);
 
 std::string GetInputDisplay();
 std::string GetRTCDisplay();