--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -40,11 +40,9 @@
 	$<INSTALL_INTERFACE:include>
 	$<INSTALL_INTERFACE:include/belle-sip>
 )
-set(PRIVATE_INCLUDE_DIRS
-	${CMAKE_CURRENT_SOURCE_DIR}/antlr3c/include
-	${CMAKE_CURRENT_BINARY_DIR}/antlr3c
-)
 set(LIBS bctoolbox)
+# Debian - link against system libantlr3c
+list(APPEND LIBS antlr3c)
 
 if(Threads_FOUND)
 	if(CMAKE_USE_PTHREADS_INIT AND NOT CMAKE_SYSTEM_NAME MATCHES "QNX" AND NOT ANDROID)
@@ -94,8 +92,6 @@
 	list(APPEND LIBS ${TUNNEL_LIBRARIES})
 endif()
 
-add_subdirectory(antlr3c)
-
 set(BELLE_SIP_SOURCE_FILES_C
 	auth_event.c
 	auth_helper.c
