diff --git a/code/ryzom/client/src/CMakeLists.txt b/code/ryzom/client/src/CMakeLists.txt
index a2f89420b..9c2b4b431 100644
--- a/code/ryzom/client/src/CMakeLists.txt
+++ b/code/ryzom/client/src/CMakeLists.txt
@@ -83,6 +83,7 @@ INCLUDE_DIRECTORIES(
 			${LUABIND_INCLUDE_DIR}
 			${LIBWWW_INCLUDE_DIR}
 			${CURL_INCLUDE_DIRS}
+			${ZLIB_INCLUDE_DIR}
 )
 
 TARGET_LINK_LIBRARIES(ryzom_client