diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27f4cd87f..c898f06e9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -110,7 +110,11 @@ if(ENABLE_UNIT_TESTS)
 	endif()
 endif()
 if(ENABLE_TUNNEL)
-	find_package(Tunnel)
+	if(LINPHONE_BUILDER_GROUP_EXTERNAL_SOURCE_PATH_BUILDERS)
+		include("${EP_tunnel_CONFIG_DIR}/TunnelConfig.cmake")
+	else()
+		find_package(Tunnel)
+	endif()
 	if(NOT TUNNEL_FOUND)
 		message(WARNING "Could not find the tunnel library!")
 		set(ENABLE_TUNNEL OFF CACHE BOOL "Enable tunnel support." FORCE)