diff --git a/include/spdlog/logger-inl.h b/include/spdlog/logger-inl.h
index 95c11839..5bfe7db3 100644
--- a/include/spdlog/logger-inl.h
+++ b/include/spdlog/logger-inl.h
@@ -10,6 +10,7 @@
 #include <spdlog/sinks/sink.h>
 
 #include <cstdio>
+#include <mutex>
 
 namespace spdlog {