diff --git a/src/platform_windows.c b/src/platform_windows.c
index f460b96..e1ae2bf 100644
--- a/src/platform_windows.c
+++ b/src/platform_windows.c
@@ -412,6 +412,7 @@ char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)
     } /* if */
 
     sprintf(retval, "%s\\%s\\%s\\", utf8, org, app);
+    allocator.Free(utf8);
     return retval;
 } /* __PHYSFS_platformCalcPrefDir */