diff --git a/Source/Core/Core/FifoPlayer/FifoDataFile.cpp b/Source/Core/Core/FifoPlayer/FifoDataFile.cpp
index 1e7ec5d77e..5c30081393 100644
--- a/Source/Core/Core/FifoPlayer/FifoDataFile.cpp
+++ b/Source/Core/Core/FifoPlayer/FifoDataFile.cpp
@@ -274,7 +274,8 @@ std::unique_ptr<FifoDataFile> FifoDataFile::Load(const std::string& filename, bo
   }
   else
   {
-    dataFile->m_game_id = std::string{header.gameid, DEFAULT_GAME_ID.size()};
+    const size_t gameid_length = strnlen(header.gameid, DEFAULT_GAME_ID.size());
+    dataFile->m_game_id = std::string{header.gameid, gameid_length};
   }
 
   if (flagsOnly)