diff --git a/src/mergerfs_api.cpp b/src/mergerfs_api.cpp
index d1b2b368..e4ab05af 100644
--- a/src/mergerfs_api.cpp
+++ b/src/mergerfs_api.cpp
@@ -32,6 +32,7 @@ int
 mergerfs::api::get_kvs(const fs::path                    &mountpoint_,
                        std::map<std::string,std::string> *kvs_)
 {
+  int rv;
   fs::path cfgfile;
 
   cfgfile = ::_mergerfs_config_file(mountpoint_);