diff --git a/code/ryzom/tools/client/client_patcher/CMakeLists.txt b/code/ryzom/tools/client/client_patcher/CMakeLists.txt
index 8cfb5c452..9616f8153 100644
--- a/code/ryzom/tools/client/client_patcher/CMakeLists.txt
+++ b/code/ryzom/tools/client/client_patcher/CMakeLists.txt
@@ -16,6 +16,7 @@ ADD_EXECUTABLE(ryzom_client_patcher ${SRC})
 INCLUDE_DIRECTORIES(
 			${LIBXML2_INCLUDE_DIR}
 			${CURL_INCLUDE_DIRS}
+			${ZLIB_INCLUDE_DIR}
 			${CMAKE_SOURCE_DIR}/ryzom/client/src
 )