diff --git a/gnu/packages/lxde.scm b/gnu/packages/lxde.scm
index 34cee44730..15cabe702b 100644
--- a/gnu/packages/lxde.scm
+++ b/gnu/packages/lxde.scm
@@ -402,6 +402,7 @@ with freedesktop.org standard.")
                 (string-append "graphical_su="
                                (search-input-file inputs "/bin/ktsuss")))))))
        #:configure-flags (list
+                          "CFLAGS=-fcommon"
                           (string-append "--with-preferable-sudo="
                                          (assoc-ref %build-inputs "ktsuss")
                                          "/bin/ktsuss")