diff --git a/src/mergerfs_api.hpp b/src/mergerfs_api.hpp
index 8d47a611..929abf63 100644
--- a/src/mergerfs_api.hpp
+++ b/src/mergerfs_api.hpp
@@ -25,15 +25,15 @@ namespace mergerfs
 
     int
     basepath(const std::string &path,
-             std::string       &basepath);
+             std::string       *basepath);
     int
     relpath(const std::string &path,
-            std::string       &relpath);
+            std::string       *relpath);
     int
     fullpath(const std::string &path,
-             std::string       &fullpath);
+             std::string       *fullpath);
     int
     allpaths(const std::string        &path,
-             std::vector<std::string> &paths);
+             std::vector<std::string> *paths);
   }
 }