diff --git a/Source/Core/Core/Slippi/SlippiMatchmaking.cpp b/Source/Core/Core/Slippi/SlippiMatchmaking.cpp
index ccb0966c7d..62db67f54b 100644
--- a/Source/Core/Core/Slippi/SlippiMatchmaking.cpp
+++ b/Source/Core/Core/Slippi/SlippiMatchmaking.cpp
@@ -85,7 +85,7 @@ std::unique_ptr<SlippiNetplayClient> SlippiMatchmaking::GetNetplayClient()
   return std::move(m_netplayClient);
 }
 
-bool IsFixedRulesMode(SlippiMatchmaking::OnlinePlayMode mode)
+bool SlippiMatchmaking::IsFixedRulesMode(SlippiMatchmaking::OnlinePlayMode mode)
 {
   return mode == SlippiMatchmaking::OnlinePlayMode::UNRANKED ||
          mode == SlippiMatchmaking::OnlinePlayMode::RANKED;