diff --git a/ChangeLog b/ChangeLog
index dea2653f90..0f048087a9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Feb 25 11:03:38 2013  Akinori MUSHA  <knu@iDaemons.org>
+
+	* configure.in (unexpand_shvar): Use the numeric comparison
+	  operator instead of '==' which is a ksh extention. [Bug #7941]
+
 Mon Feb 25 02:37:56 2013  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket: define and use union_sockaddr instead of struct
diff --git a/configure.in b/configure.in
index be7d4feb45..5fdac50fdc 100644
--- a/configure.in
+++ b/configure.in
@@ -3282,7 +3282,7 @@ shvar_to_cpp() {
 unexpand_shvar() {
     local var=$1 val n v expr quote
     shift
-    test "$#" == 0 && return
+    test "$#" -eq 0 && return
     quote=['s/${[^${}"]*}/"&"/g']
     for n do
         eval v='"$'$n'"'