--- a/acinclude.m4
+++ b/acinclude.m4
@@ -61,9 +61,9 @@
 # "-R" here.
 #
 AC_DEFUN([AC_WIRESHARK_ADD_DASH_L],
-[$1="$$1 -L$2"
-case "$host_os" in
+[case "$host_os" in
   solaris*)
+    $1="$$1 -L$2"
     $1="$$1 -R$2"
   ;;
 esac