diff --git a/bug_report_page.php b/bug_report_page.php
index eb3a180..95d3ec7 100644
--- a/bug_report_page.php
+++ b/bug_report_page.php
@@ -498,7 +498,7 @@
 			<?php echo lang_get( 'relationship_with_parent' ) ?>
 		</td>
 		<td>
-			<?php relationship_list_box( /* none */ -2, "rel_type", false, true ) ?>
+			<?php relationship_list_box( config_get( 'default_bug_relationship_clone' ), "rel_type", false, true ) ?>
 			<?php echo '<b>' . lang_get( 'bug' ) . ' ' . bug_format_id( $f_master_bug_id ) . '</b>' ?>
 		</td>
 	</tr>
diff --git a/config_defaults_inc.php b/config_defaults_inc.php
index 59b4764..8b8dceb 100644
--- a/config_defaults_inc.php
+++ b/config_defaults_inc.php
@@ -1159,6 +1159,12 @@
 	$g_default_bug_eta = ETA_NONE;

 	/**
+	 * Default relationship between a new bug and its parent when cloning it
+	 * @global int $g_default_bug_relationship_clone
+	 */
+	$g_default_bug_relationship_clone = BUG_REL_NONE;
+
+	/**
 	 * Default global category to be used when an issue is moved from a project to another
 	 * that doesn't have a category with a matching name.  The default is 1 which is the "General"
 	 * category that is created in the default database.
diff --git a/core/constant_inc.php b/core/constant_inc.php
index 982fcf0..2db57f9 100644
--- a/core/constant_inc.php
+++ b/core/constant_inc.php
@@ -200,6 +200,8 @@ define( 'REV_ADDITIONAL_INFO', 3 );
 define( 'REV_BUGNOTE', 4 );

 # bug relationship constants
+define( 'BUG_REL_NONE', -2 );
+define( 'BUG_REL_ANY', -1 );
 define( 'BUG_DUPLICATE', 0 );
 define( 'BUG_RELATED', 1 );
 define( 'BUG_DEPENDANT', 2 );
diff --git a/core/relationship_api.php b/core/relationship_api.php
index b0949ea..0f33222 100644
--- a/core/relationship_api.php
+++ b/core/relationship_api.php
@@ -772,17 +772,17 @@ function relationship_get_summary_text( $p_bug_id ) {
  * @param int $p_bug_id Bug id
  * @return null
  */
-function relationship_list_box( $p_default_rel_type = -1, $p_select_name = "rel_type", $p_include_any = false, $p_include_none = false ) {
+function relationship_list_box( $p_default_rel_type = BUG_REL_ANY, $p_select_name = "rel_type", $p_include_any = false, $p_include_none = false ) {
 	global $g_relationships;
 	?>
 <select name="<?php echo $p_select_name?>">
 <?php if( $p_include_any ) {?>
-<option value="-1" <?php echo( $p_default_rel_type == -1 ? ' selected="selected"' : '' )?>>[<?php echo lang_get( 'any' )?>]</option>
+<option value="<?php BUG_REL_ANY ?>" <?php echo( $p_default_rel_type == BUG_REL_ANY ? ' selected="selected"' : '' )?>>[<?php echo lang_get( 'any' )?>]</option>
 <?php
 	}

 	if( $p_include_none ) {?>
-<option value="-2" <?php echo( $p_default_rel_type == -2 ? ' selected="selected"' : '' )?>>[<?php echo lang_get( 'none' )?>]</option>
+<option value="<?php BUG_REL_NONE ?>" <?php echo( $p_default_rel_type == BUG_REL_NONE ? ' selected="selected"' : '' )?>>[<?php echo lang_get( 'none' )?>]</option>
 <?php
 	}

@@ -833,7 +833,7 @@ function relationship_view_box( $p_bug_id ) {
 		<form method="post" action="bug_relationship_add.php">
 		<?php echo form_security_field( 'bug_relationship_add' ) ?>
 		<input type="hidden" name="src_bug_id" value="<?php echo $p_bug_id?>" size="4" />
-		<?php relationship_list_box( -1 )?>
+		<?php relationship_list_box( BUG_REL_ANY )?>
 		<input type="text" name="dest_bug_id" value="" />
 		<input type="submit" name="add_relationship" class="button" value="<?php echo lang_get( 'add_new_relationship_button' )?>" />
 		</form>