diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8075690d4d..49661290fa 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -52,6 +52,7 @@ target_link_libraries( testClientMachine
                        ${KDE4_KDEUI_LIBS}
                        ${XCB_XCB_LIBRARIES}
                        ${X11_XCB_LIBRARIES}
+                       ${X11_X11_LIB} # to make jenkins happy
 )
 
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