diff --git a/src/core.cpp b/src/core.cpp
index b612cc54..e12509c6 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -166,7 +166,13 @@ static bool init_sandbox() {
                 && !(parsed_game_path.length() >= 6 && std::strcmp(parsed_game_path.c_str() + (parsed_game_path.length() - 6), ".mkxpz") == 0)
                 && !(parsed_game_path.length() >= 6 && std::strcmp(parsed_game_path.c_str() + (parsed_game_path.length() - 6), ".MKXPZ") == 0)
         ) {
-            size_t last_slash_index = parsed_game_path.find_last_of('/');
+            size_t last_slash_index = parsed_game_path.find_last_of(
+#ifdef _WIN32
+                '\\'
+#else
+                '/'
+#endif // _WIN32
+            );
             if (last_slash_index == std::string::npos) {
                 last_slash_index = 0;
             }