diff --git a/fairmq/CMakeLists.txt b/fairmq/CMakeLists.txt
index 658d935b..a8524124 100644
--- a/fairmq/CMakeLists.txt
+++ b/fairmq/CMakeLists.txt
@@ -8,7 +8,6 @@
 Set(INCLUDE_DIRECTORIES
   ${CMAKE_SOURCE_DIR}/fairmq
   ${CMAKE_SOURCE_DIR}/fairmq/devices
-  ${CMAKE_SOURCE_DIR}/fairmq/examples/req-rep
   ${CMAKE_SOURCE_DIR}/fairmq/tools
 )
 
@@ -19,6 +18,7 @@ Set(SYSTEM_INCLUDE_DIRECTORIES
 If(PROTOBUF_FOUND)
   Set(INCLUDE_DIRECTORIES
     ${INCLUDE_DIRECTORIES}
+    ${CMAKE_SOURCE_DIR}/fairmq/examples/req-rep
     # # following directory is only for protobuf tests and is not essential part of FairMQ
     #${CMAKE_SOURCE_DIR}/fairmq/prototest
   )