diff --git a/apps/gateway/CMakeLists.txt b/apps/gateway/CMakeLists.txt
index 19ed108d..7cd36b16 100644
--- a/apps/gateway/CMakeLists.txt
+++ b/apps/gateway/CMakeLists.txt
@@ -7,6 +7,7 @@ mISDNStack.cpp
 )
 
 ADD_DEFINITIONS(-DGW_VERSION="0.1")
+INCLUDE_DIRECTORIES(${MISDN_INCLUDE_DIR}/mISDNuser)
 
 ADD_LIBRARY(gateway SHARED ${gateway_SRCS})
 SET_TARGET_PROPERTIES(gateway PROPERTIES OUTPUT_NAME "gateway")