diff --git a/includes/api/ApiQueryAbuseLog.php b/includes/api/ApiQueryAbuseLog.php
index 1a18832e7..a44cee0c4 100644
--- a/includes/api/ApiQueryAbuseLog.php
+++ b/includes/api/ApiQueryAbuseLog.php
@@ -97,11 +97,12 @@ class ApiQueryAbuseLog extends ApiQueryBase {
 		$this->addFieldsIf( 'afl_actions', $fld_result );
 		$this->addFieldsIf( 'afl_wiki', $fld_wiki );
 
+		$db = $this->getDB();
 		if ( $fld_filter ) {
 			$this->addTables( 'abuse_filter' );
 			$this->addFields( 'af_public_comments' );
 			$this->addJoinConds( [ 'abuse_filter' => [ 'LEFT JOIN',
-					'af_id=afl_filter' ] ] );
+					$db->buildStringCast( 'af_id' ) . '=afl_filter' ] ] );
 		}
 
 		$this->addOption( 'LIMIT', $params['limit'] + 1 );
diff --git a/includes/pagers/AbuseLogPager.php b/includes/pagers/AbuseLogPager.php
index 5e73feb2b..068fffcc2 100644
--- a/includes/pagers/AbuseLogPager.php
+++ b/includes/pagers/AbuseLogPager.php
@@ -45,7 +45,7 @@ class AbuseLogPager extends ReverseChronologicalPager {
 				[ 'abuse_filter' =>
 					[
 						'LEFT JOIN',
-						'af_id=afl_filter',
+						$this->mDb->buildStringCast( 'af_id' ) . '=afl_filter',
 					],
 				],
 		];
diff --git a/includes/special/SpecialAbuseLog.php b/includes/special/SpecialAbuseLog.php
index ac0bfdb96..33f6254ed 100644
--- a/includes/special/SpecialAbuseLog.php
+++ b/includes/special/SpecialAbuseLog.php
@@ -320,7 +320,7 @@ class SpecialAbuseLog extends SpecialPage {
 			[ 'afl_id' => $id ],
 			__METHOD__,
 			[],
-			[ 'abuse_filter' => [ 'LEFT JOIN', 'af_id=afl_filter' ] ]
+			[ 'abuse_filter' => [ 'LEFT JOIN', $dbr->buildStringCast( 'af_id' ) . '=afl_filter' ] ]
 		);
 
 		if ( !$row ) {
@@ -572,7 +572,7 @@ class SpecialAbuseLog extends SpecialPage {
 			[ 'afl_id' => $id ],
 			__METHOD__,
 			[],
-			[ 'abuse_filter' => [ 'LEFT JOIN', 'af_id=afl_filter' ] ]
+			[ 'abuse_filter' => [ 'LEFT JOIN', $dbr->buildStringCast( 'af_id' ) . '=afl_filter' ] ]
 		);
 
 		$error = null;
@@ -707,7 +707,7 @@ class SpecialAbuseLog extends SpecialPage {
 			[ 'afl_id' => $id ],
 			__METHOD__,
 			[],
-			[ 'abuse_filter' => [ 'LEFT JOIN', 'af_id=afl_filter' ] ]
+			[ 'abuse_filter' => [ 'LEFT JOIN', $dbr->buildStringCast( 'af_id' ) . '=afl_filter' ] ]
 		);
 
 		$error = null;