diff --git a/mozilla/config/mkdetect/detect_motif.sh b/mozilla/config/mkdetect/detect_motif.sh
index febd5a365e8..979562c9d95 100755
--- a/mozilla/config/mkdetect/detect_motif.sh
+++ b/mozilla/config/mkdetect/detect_motif.sh
@@ -105,6 +105,7 @@ DEFAULT_MOTIF_SEARCH_PATH="\
 /usr/local \
 /usr/dt \
 /usr/X11R6 \
+/usr/X \
 /usr \
 "