diff --git a/include/spdlog/fmt/bin_to_hex.h b/include/spdlog/fmt/bin_to_hex.h
index 7a94db7a..8d2efdff 100644
--- a/include/spdlog/fmt/bin_to_hex.h
+++ b/include/spdlog/fmt/bin_to_hex.h
@@ -6,6 +6,7 @@
 #pragma once
 
 #include <cctype>
+#include <spdlog/spdlog.h>
 
 //
 // Support for logging binary data as hex