diff --git a/pathexp.c b/pathexp.c
--- a/pathexp.c
+++ b/pathexp.c
@@ -58,7 +58,10 @@ int extended_glob = EXTGLOB_DEFAULT;
 /* Control enabling special handling of `**' */
 int glob_star = 0;
 
-/* Return nonzero if STRING has any unquoted special globbing chars in it.  */
+/* Return nonzero if STRING has any unquoted special globbing chars in it.
+   This is supposed to be called when pathname expansion is performed, so
+   it implements the rules in Posix 2.13.3, specifically that an unquoted
+   slash cannot appear in a bracket expression. */
 int
 unquoted_glob_pattern_p (string)
      register char *string;
@@ -89,6 +92,10 @@ unquoted_glob_pattern_p (string)
 	    return (1);
 	  continue;
 
+	case '/':
+	  if (open)
+	    open = 0;
+
 	case '+':
 	case '@':
 	case '!':
@@ -98,7 +105,12 @@ unquoted_glob_pattern_p (string)
 
 	case CTLESC:
 	case '\\':
-	  if (*string++ == '\0')
+	  if (open && *string == '/')
+	    {
+	      string++;		/* quoted slashes in bracket expressions are ok */
+	      continue;
+	    }
+      else if (*string++ == '\0')
 	    return (0);
 	}