diff --git a/src/fdcache_entity.cpp b/src/fdcache_entity.cpp
index ece2bf2..6d522c0 100644
--- a/src/fdcache_entity.cpp
+++ b/src/fdcache_entity.cpp
@@ -22,6 +22,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <climits>
+#include <cstring>
 #include <memory>
 #include <unistd.h>
 #include <sys/stat.h>
diff --git a/src/s3fs.cpp b/src/s3fs.cpp
index a973ba2..1503a46 100644
--- a/src/s3fs.cpp
+++ b/src/s3fs.cpp
@@ -149,7 +149,7 @@ static int set_bucket(const char* arg);
 static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_args* outargs);
 static fsblkcnt_t parse_bucket_size(char* value);
 static bool is_cmd_exists(const std::string& command);
-static int print_umount_message(const std::string& mp, bool force);
+static int print_umount_message(const std::string& mp, bool force) __attribute__ ((unused));
 
 //-------------------------------------------------------------------
 // fuse interface functions