diff --git a/cmake_targets/nas_sim_tools/CMakeLists.txt b/cmake_targets/nas_sim_tools/CMakeLists.txt
index c1a0bb419b..308c71be4c 100644
--- a/cmake_targets/nas_sim_tools/CMakeLists.txt
+++ b/cmake_targets/nas_sim_tools/CMakeLists.txt
@@ -14,6 +14,7 @@ set(CMAKE_C_FLAGS
 
 set(OPENAIR_DIR     $ENV{OPENAIR_DIR})
 set(OPENAIR3_DIR    $ENV{OPENAIR_DIR}/openair3)
+include_directories (${OPENAIR_DIR}/openair2/COMMON)
 
 set(CONF2UEDATA_LIB_SRC
     ${OPENAIR_DIR}/openair3/NAS/TOOLS/conf_emm.c