diff --git a/include/spdlog/details/pattern_formatter_impl.h b/include/spdlog/details/pattern_formatter_impl.h
index c4855132..3965b831 100644
--- a/include/spdlog/details/pattern_formatter_impl.h
+++ b/include/spdlog/details/pattern_formatter_impl.h
@@ -8,6 +8,7 @@
 #include <spdlog/formatter.h>
 #include <spdlog/details/log_msg.h>
 #include <spdlog/details/os.h>
+#include <spdlog/details/format.h>
 
 #include <chrono>
 #include <ctime>
diff --git a/include/spdlog/sinks/file_sinks.h b/include/spdlog/sinks/file_sinks.h
index d0928730..c3d214fa 100644
--- a/include/spdlog/sinks/file_sinks.h
+++ b/include/spdlog/sinks/file_sinks.h
@@ -8,7 +8,7 @@
 #include <spdlog/sinks/base_sink.h>
 #include <spdlog/details/null_mutex.h>
 #include <spdlog/details/file_helper.h>
-
+#include <spdlog/details/format.h>
 
 #include <algorithm>
 #include <chrono>