diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07f822c..4c0dc52 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,7 +97,7 @@ if (NOT ${BUILD_PROMETHEUS})
   list(REMOVE_ITEM ALL_TESTS ${ALL_PROMETHEUS_FILES})
   list(REMOVE_ITEM ALL_EXECUTABLES ${ALL_PROMETHEUS_FILES})
 endif()
-set(INSTALL_SOURCE_HDRS ${ALL_LIBRARY_HDRS})
+set(INSTALL_SOURCE_HDRS ${ALL_LIBRARY_HDRS} ${TEST_LIBRARY_HDRS})
 file(GLOB_RECURSE INTERNAL_HDRS "cartographer/*/internal/*.h")
 list(REMOVE_ITEM INSTALL_SOURCE_HDRS ${INTERNAL_HDRS})