diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12a09483..4915ec4e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ if (CMAKE_GENERATOR MATCHES "Visual Studio")
     ${CMAKE_MAKE_PROGRAM} %*")
 endif ()
 
-add_library(format format.cc)
+add_library(format format.cc format.h)
 if (CMAKE_COMPILER_IS_GNUCXX)
   set_target_properties(format PROPERTIES COMPILE_FLAGS
     "-Wall -Wextra -pedantic")