Index: subversion/libsvn_wc/props.c
===================================================================
--- subversion/libsvn_wc/props.c	(revision 28329)
+++ subversion/libsvn_wc/props.c	(working copy)
@@ -2599,8 +2599,15 @@
 
   if (!skip_some_checks && (strcmp(propname, SVN_PROP_EOL_STYLE) == 0))
     {
+      svn_subst_eol_style_t eol_style;
+      const char *ignored_eol;
       new_value = svn_stringbuf_create_from_string(propval, pool);
       svn_stringbuf_strip_whitespace(new_value);
+      svn_subst_eol_style_from_value(&eol_style, &ignored_eol, new_value->data);
+      if (eol_style == svn_subst_eol_style_unknown)
+        return svn_error_createf(SVN_ERR_IO_UNKNOWN_EOL, NULL,
+                                 _("Unrecognized line ending style for '%s'"),
+                                 svn_path_local_style(path, pool));
       SVN_ERR(validate_eol_prop_against_file(path, getter, getter_baton,
                                              pool));
     }