diff --git a/ContributionScores.php b/ContributionScores.php
index 93ad076..dac29ce 100644
--- a/ContributionScores.php
+++ b/ContributionScores.php
@@ -42,11 +42,7 @@ if( version_compare( $wgVersion, '1.13', '>=' ) ) {
 
 $wgHooks['LanguageGetMagic'][] = 'efContributionScores_LanguageGetMagic';
 
-if ( defined( 'MW_SUPPORTS_PARSERFIRSTCALLINIT' ) ) {
-	$wgHooks['ParserFirstCallInit'][] = 'efContributionScores_Setup';
-} else {
-	$wgExtensionFunctions[] = 'efContributionScores_Setup';
-}
+$wgHooks['ParserFirstCallInit'][] = 'efContributionScores_Setup';
 
 ///Message Cache population for versions that did not support $wgExtensionFunctions
 function efContributionScores_AddMessages() {
@@ -60,10 +56,8 @@ function efContributionScores_AddMessages() {
 	return true;
 }
 
-function efContributionScores_Setup() {
-	global $wgParser;
-
-	$wgParser->setFunctionHook( 'cscore', 'efContributionScores_Render' );
+function efContributionScores_Setup( &$parser ) {
+	$parser->setFunctionHook( 'cscore', 'efContributionScores_Render' );
 	return true;
 }