diff --git a/configure.in b/configure.in
index e3f14b3282b..93cd86affb2 100644
--- a/configure.in
+++ b/configure.in
@@ -1896,7 +1896,7 @@ LIBXMU=-lXmu
 case "$machine" in
   ## These machines don't supply Xmu.
   hpux* | aix4-2 )
-    test "X$ac_cv_lib_Xmu_XmuConvertStandardSelection" = "Xno" && LIBXMU=
+    test "X$ac_cv_lib_Xmu_XmuConvertStandardSelection" != "Xyes" && LIBXMU=
     ;;
 esac
 AC_SUBST(LIBXMU)