diff --git a/src/config.c b/src/config.c
index d39546e1..4f7ddda9 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1154,6 +1154,8 @@ void configGetCommand(redisClient *c) {
  *
  */
 
+#define REDIS_CONFIG_REWRITE_SIGNATURE "# Generated by CONFIG REWRITE"
+
 /* We use the following dictionary type to store where a configuration
  * option is mentioned in the old configuration file, so it's
  * like "maxmemory" -> list of line numbers (first line is zero). */
@@ -1230,6 +1232,8 @@ struct rewriteConfigState *rewriteConfigReadOldFile(char *path) {
 
         /* Handle comments and empty lines. */
         if (line[0] == '#' || line[0] == '\0') {
+            if (!state->has_tail && !strcmp(line,REDIS_CONFIG_REWRITE_SIGNATURE))
+                state->has_tail = 1;
             rewriteConfigAppendLine(state,line);
             continue;
         }
@@ -1301,7 +1305,7 @@ void rewriteConfigRewriteLine(struct rewriteConfigState *state, char *option, sd
         /* Append a new line. */
         if (!state->has_tail) {
             rewriteConfigAppendLine(state,
-                sdsnew("# Generated by CONFIG REWRITE"));
+                sdsnew(REDIS_CONFIG_REWRITE_SIGNATURE));
             state->has_tail = 1;
         }
         rewriteConfigAppendLine(state,line);