diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3cd8a34..ceaa9ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -408,6 +408,7 @@ SET(mod_heartbeat_extra_libs         mod_watchdog)
 SET(mod_http2_requires               NGHTTP2_FOUND)
 SET(mod_http2_extra_defines          ssize_t=long)
 SET(mod_http2_extra_libs             ${NGHTTP2_LIBRARIES})
+SET(mod_http2_extra_includes         ${NGHTTP2_INCLUDE_DIR})
 SET(mod_http2_extra_sources
   modules/http2/h2_alt_svc.c
   modules/http2/h2_bucket_eos.c      modules/http2/h2_config.c