diff --git a/include/spdlog/details/tcp_client.h b/include/spdlog/details/tcp_client.h
index dcb1047e..a6f9b80d 100644
--- a/include/spdlog/details/tcp_client.h
+++ b/include/spdlog/details/tcp_client.h
@@ -17,6 +17,7 @@
 #include <netinet/tcp.h>
 #include <sys/socket.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 #include <string>