diff --git a/src/cache.cpp b/src/cache.cpp
index 744e536be..9b9016582 100644
--- a/src/cache.cpp
+++ b/src/cache.cpp
@@ -21,6 +21,7 @@
 #include <algorithm>
 #include <cerrno>
 #include <cstdlib>
+#include <mutex>
 #include <string>
 #include <sys/stat.h>
 #include <utility>
diff --git a/src/curl.cpp b/src/curl.cpp
index ace0928d3..77656a4b5 100644
--- a/src/curl.cpp
+++ b/src/curl.cpp
@@ -25,6 +25,7 @@
 #include <ctime>
 #include <fstream>
 #include <memory>
+#include <mutex>
 #include <sstream>
 #include <string>
 #include <unistd.h>
diff --git a/src/curl_handlerpool.cpp b/src/curl_handlerpool.cpp
index 71ff3252e..d8c36e34c 100644
--- a/src/curl_handlerpool.cpp
+++ b/src/curl_handlerpool.cpp
@@ -19,6 +19,7 @@
  */
 
 #include <cstdio>
+#include <mutex>
 #include <utility>
 
 #include "s3fs_logger.h"
diff --git a/src/curl_multi.cpp b/src/curl_multi.cpp
index b81ef5ab2..1f19ba1d4 100644
--- a/src/curl_multi.cpp
+++ b/src/curl_multi.cpp
@@ -22,6 +22,7 @@
 #include <cstdlib>
 #include <cerrno>
 #include <future>
+#include <mutex>
 #include <thread>
 #include <utility>
 #include <vector>
diff --git a/src/fdcache.cpp b/src/fdcache.cpp
index 4dda9e2a0..ae0545f74 100644
--- a/src/fdcache.cpp
+++ b/src/fdcache.cpp
@@ -24,6 +24,7 @@
 #include <climits>
 #include <unistd.h>
 #include <dirent.h>
+#include <mutex>
 #include <string>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
diff --git a/src/fdcache_entity.cpp b/src/fdcache_entity.cpp
index 9ef84c405..47a7faaef 100644
--- a/src/fdcache_entity.cpp
+++ b/src/fdcache_entity.cpp
@@ -24,6 +24,7 @@
 #include <climits>
 #include <cstring>
 #include <memory>
+#include <mutex>
 #include <string>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/src/fdcache_fdinfo.cpp b/src/fdcache_fdinfo.cpp
index 75ee781f3..f69acce23 100644
--- a/src/fdcache_fdinfo.cpp
+++ b/src/fdcache_fdinfo.cpp
@@ -23,6 +23,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <memory>
+#include <mutex>
 #include <string>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/src/fdcache_pseudofd.cpp b/src/fdcache_pseudofd.cpp
index c9d9ada86..3c3e4bc3b 100644
--- a/src/fdcache_pseudofd.cpp
+++ b/src/fdcache_pseudofd.cpp
@@ -20,6 +20,7 @@
 
 #include <algorithm>
 #include <cstdlib>
+#include <mutex>
 #include <vector>
 
 #include "fdcache_pseudofd.h"
diff --git a/src/fdcache_untreated.cpp b/src/fdcache_untreated.cpp
index c62ec5d66..2b7e08378 100644
--- a/src/fdcache_untreated.cpp
+++ b/src/fdcache_untreated.cpp
@@ -19,6 +19,7 @@
  */
 
 #include <cstdlib>
+#include <mutex>
 
 #include "s3fs_logger.h"
 #include "fdcache_untreated.h"
diff --git a/src/s3fs_cred.cpp b/src/s3fs_cred.cpp
index d09174b34..c903322f5 100644
--- a/src/s3fs_cred.cpp
+++ b/src/s3fs_cred.cpp
@@ -24,6 +24,7 @@
 #include <sys/stat.h>
 #include <dlfcn.h>
 #include <fstream>
+#include <mutex>
 #include <sstream>
 #include <string>
 
diff --git a/src/threadpoolman.cpp b/src/threadpoolman.cpp
index 381b3c8e7..a64ba7837 100644
--- a/src/threadpoolman.cpp
+++ b/src/threadpoolman.cpp
@@ -22,6 +22,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <future>
+#include <mutex>
 #include <thread>
 #include <utility>