diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5889cee4e242..6dcb03744f62 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -183,8 +183,9 @@ function(add_headers VAR)
 endfunction()
 
 # Define the fmt library, its includes and the needed defines.
-add_headers(FMT_HEADERS chrono.h color.h compile.h core.h format.h format-inl.h
-                        locale.h os.h ostream.h posix.h printf.h ranges.h)
+add_headers(FMT_HEADERS args.h chrono.h color.h compile.h core.h format.h
+                        format-inl.h locale.h os.h ostream.h posix.h printf.h
+                        ranges.h)
 if (FMT_OS)
   set(FMT_SOURCES src/format.cc src/os.cc)
 else()