diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 749609ae..ab7ca342 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -55,6 +55,10 @@ INCLUDE_DIRECTORIES (amci)
 ADD_EXECUTABLE (sems ${sems_SRCS})
 TARGET_LINK_LIBRARIES(sems ${CMAKE_DL_LIBS} pthread stdc++ m)
 
+IF(NOT MAX_RTP_SESSIONS)
+	SET(MAX_RTP_SESSIONS 2048)
+ENDIF(NOT MAX_RTP_SESSIONS)
+
 IF(CMAKE_COMPILER_IS_GNUCC)
 	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DMAX_RTP_SESSIONS=${MAX_RTP_SESSIONS}")
 ENDIF(CMAKE_COMPILER_IS_GNUCC)