--- tables/apr_tables.c	(revision 1876740)
+++ tables/apr_tables.c	(working copy)
@@ -1102,6 +1102,7 @@ 
     apr_table_entry_t **last;
     int i;
     int dups_found;
+    apr_uint32_t cookie_checksum;
 
     if (flags == APR_OVERLAP_TABLES_ADD) {
         return;
@@ -1131,6 +1132,8 @@ 
      */
     sort_array = table_mergesort(t->a.pool, sort_array, t->a.nelts);
 
+    COMPUTE_KEY_CHECKSUM("Cookie", cookie_checksum);
+
     /* Process any duplicate keys */
     dups_found = 0;
     sort_next = sort_array;
@@ -1154,6 +1157,11 @@ 
                 apr_table_entry_t **next = last;
                 char *new_val;
                 char *val_dst;
+                char separator = ',';
+                if ((*last)->key_checksum == cookie_checksum
+                        && !strcasecmp((*last)->key, "Cookie")) {
+                    separator = ';';
+                }
                 do {
                     len += strlen((*next)->val);
                     len += 2; /* for ", " or trailing null */
@@ -1170,7 +1178,7 @@ 
                         break;
                     }
                     else {
-                        *val_dst++ = ',';
+                        *val_dst++ = separator;
                         *val_dst++ = ' ';
                     }
                 }