diff --git a/mcs-plugin/Makefile.am b/mcs-plugin/Makefile.am
index 3755e694563b15b478fe8e269249625f7ec43cc3..d56fe1e1a29fe75726ca5b9fef00e701b2408b79 100644
--- a/mcs-plugin/Makefile.am
+++ b/mcs-plugin/Makefile.am
@@ -37,6 +37,11 @@ xfwm4_plugin_la_LIBADD =						\
 	@LIBXFCE4MCS_MANAGER_LIBS@					\
 	@LIBS@
 
+if HAVE_CYGWIN
+xfwm4_plugin_la_LIBADD +=						\
+	@LIBX11_LIBS@
+endif
+
 workspaces_plugindir = @XFCE_MCS_MANAGER_PLUGINSDIR@
 
 workspaces_plugin_LTLIBRARIES = workspaces_plugin.la