diff -up ./src/expand.c.orig ./src/expand.c
--- ./src/expand.c.orig	2016-06-01 12:42:49.330373488 +0200
+++ ./src/expand.c	2016-06-07 14:35:16.011142041 +0200
@@ -173,15 +173,19 @@ expand (void)
 
       do
         {
-          do {
+          while (true) {
             mbf_getc (c, mbf);
-            if (mb_iseof (c))
+            if ((mb_iseof (c)) && (fp = next_file (fp)))
               {
-                mbf_init (mbf, fp = next_file (fp));
+                mbf_init (mbf, fp);
                 continue;
               }
+            else
+              {
+                break;
+              }
             }
-          while (false);
+          
 
           if (convert)
             {
diff -up ./src/unexpand.c.orig ./src/unexpand.c
--- ./src/unexpand.c.orig	2016-06-07 14:26:57.380746446 +0200
+++ ./src/unexpand.c	2016-06-07 14:34:54.059256698 +0200
@@ -220,15 +220,19 @@ unexpand (void)
 
       do
         {
-          do {
+          while (true) {
             mbf_getc (c, mbf);
-            if (mb_iseof (c))
+            if ((mb_iseof (c)) && (fp = next_file (fp)))
               {
-                mbf_init (mbf, fp = next_file (fp));
+                mbf_init (mbf, fp);
                 continue;
               }
+            else
+              {
+                break;
+              }
             }
-          while (false);
+          
 
           if (convert)
             {
diff -up ./tests/expand/mb.sh.orig ./tests/expand/mb.sh
--- ./tests/expand/mb.sh.orig	2016-05-11 14:13:53.095289000 +0200
+++ ./tests/expand/mb.sh	2016-06-07 14:38:48.259033445 +0200
@@ -44,6 +44,20 @@ EOF
 expand < in > out || fail=1
 compare exp out > /dev/null 2>&1 || fail=1
 
+#multiple files as an input
+cat <<\EOF >> exp || framework_failure_
+1234567812345678123456781
+.       .       .       .
+a       b       c       d
+.       .       .       .
+ä       ö       ü       ß
+.       .       .       .
+   äöü  .    öüä.       ä xx
+EOF
+
+expand ./in ./in > out || fail=1
+compare exp out > /dev/null 2>&1 || fail=1
+
 #test characters with display widths != 1
 env printf '12345678
 e\t|ascii(1)
diff -up ./tests/unexpand/mb.sh.orig ./tests/unexpand/mb.sh
--- ./tests/unexpand/mb.sh.orig	2016-06-07 14:41:44.210106466 +0200
+++ ./tests/unexpand/mb.sh	2016-06-07 14:52:28.848639772 +0200
@@ -44,6 +44,22 @@ EOF
 unexpand -a < in > out || fail=1
 compare exp out > /dev/null 2>&1 || fail=1
 
+
+#multiple files as an input
+cat >> exp <<\EOF
+1234567812345678123456781
+.	.	.	.
+a	b	c	d
+.	.	.	.
+ä	ö	ü	ß
+.	.	.	.
+   äöü	.    öüä.	ä xx
+EOF
+
+
+unexpand -a ./in ./in > out || fail=1
+compare exp out > /dev/null 2>&1 || fail=1
+
 #test characters with a display width larger than 1
 
 env printf '12345678