diff --git a/channel.c b/channel.c
index 2f3950195d..a55dcb3837 100644
--- a/channel.c
+++ b/channel.c
@@ -2891,7 +2891,7 @@ static void clone_variables(struct ast_channel *original, struct ast_channel *cl
 
 	AST_LIST_TRAVERSE_SAFE_BEGIN(&original->varshead, varptr, entries) {
 		if (!strncmp(ast_var_name(varptr), GROUP_CATEGORY_PREFIX, strlen(GROUP_CATEGORY_PREFIX))) {
-			AST_LIST_REMOVE(&original->varshead, varptr, entries);
+			AST_LIST_REMOVE_CURRENT(&original->varshead, entries);
 			ast_var_delete(varptr);
 		}
 	}
@@ -2900,7 +2900,7 @@ static void clone_variables(struct ast_channel *original, struct ast_channel *cl
 	/* Append variables from clone channel into original channel */
 	/* XXX Is this always correct?  We have to in order to keep MACROS working XXX */
 	if (AST_LIST_FIRST(&clone->varshead))
-		AST_LIST_INSERT_TAIL(&original->varshead, AST_LIST_FIRST(&clone->varshead), entries);
+		AST_LIST_APPEND_LIST(&original->varshead, &clone->varshead, entries);
 }
 
 /*--- ast_do_masquerade: Masquerade a channel */
diff --git a/include/asterisk/linkedlists.h b/include/asterisk/linkedlists.h
index b91d117782..3ac3bffa7d 100644
--- a/include/asterisk/linkedlists.h
+++ b/include/asterisk/linkedlists.h
@@ -429,6 +429,23 @@ struct {								\
       }									\
 } while (0)
 
+/*!
+  \brief Appends a whole list to the tail of a list.
+  \param head This is a pointer to the list head structure
+  \param list This is a pointer to the list to be appended.
+  \param field This is the name of the field (declared using AST_LIST_ENTRY())
+  used to link entries of this list together.
+ */
+#define AST_LIST_APPEND_LIST(head, list, field) do {			\
+      if (!(head)->first) {						\
+		(head)->first = (list)->first;				\
+		(head)->last = (list)->last;				\
+      } else {								\
+		(head)->last->field.next = (list)->first;		\
+		(head)->last = (list)->last;				\
+      }									\
+} while (0)
+
 /*!
   \brief Removes and returns the head entry from a list.
   \param head This is a pointer to the list head structure
diff --git a/pbx.c b/pbx.c
index ad57810a9d..f546180395 100644
--- a/pbx.c
+++ b/pbx.c
@@ -5906,9 +5906,7 @@ int pbx_builtin_serialize_variables(struct ast_channel *chan, char *buf, size_t
 	memset(buf, 0, size);
 
 	AST_LIST_TRAVERSE(&chan->varshead, variables, entries) {
-		if(variables &&
-		   (var=ast_var_name(variables)) && (val=ast_var_value(variables)) &&
-		   !ast_strlen_zero(var) && !ast_strlen_zero(val)) {
+		if ((var = ast_var_name(variables)) && (val = ast_var_value(variables))) {
 			if (ast_build_string(&buf, &size, "%s=%s\n", var, val)) {
 				ast_log(LOG_ERROR, "Data Buffer Size Exceeded!\n");
 				break;