diff --git a/mozilla/configure.in b/mozilla/configure.in
index 0f2454c44ba..5a2d6ff0fda 100644
--- a/mozilla/configure.in
+++ b/mozilla/configure.in
@@ -155,7 +155,7 @@ AC_PATH_PROG(ZIP, zip, :)
 AC_PATH_XTRA
 
 XLDFLAGS="$X_LIBS"
-XLIBS="$X_EXTRA_LIBS"
+XLIBS="-lX11 $X_EXTRA_LIBS"
 
 GNU_CC=
 GNU_CXX=