diff --git a/build/ci-scripts/mw-apply-wb-settings.sh b/build/ci-scripts/mw-apply-wb-settings.sh
index c532dc23f57..add2061c718 100755
--- a/build/ci-scripts/mw-apply-wb-settings.sh
+++ b/build/ci-scripts/mw-apply-wb-settings.sh
@@ -17,7 +17,7 @@ function apply_repo_settings {
 }
 
 function apply_common_before_settings {
-  echo 'error_reporting(E_ALL| E_STRICT);' >> LocalSettings.php
+  echo 'error_reporting(E_ALL);' >> LocalSettings.php
   echo 'ini_set("display_errors", 1);' >> LocalSettings.php
   # For re-using the Wikimedia CI settings, pretend we're running in quibble
   echo 'if ( !defined( "MW_QUIBBLE_CI" ) ) define( "MW_QUIBBLE_CI", true );' >> LocalSettings.php
diff --git a/lib/packages/wikibase/data-model-serialization/tests/bootstrap.php b/lib/packages/wikibase/data-model-serialization/tests/bootstrap.php
index f754382663c..b4bb459d237 100644
--- a/lib/packages/wikibase/data-model-serialization/tests/bootstrap.php
+++ b/lib/packages/wikibase/data-model-serialization/tests/bootstrap.php
@@ -4,7 +4,7 @@
 	die( 'Not an entry point' );
 }
 
-error_reporting( E_ALL | E_STRICT );
+error_reporting( E_ALL );
 ini_set( 'display_errors', 1 );
 
 if ( !is_readable( __DIR__ . '/../vendor/autoload.php' ) ) {
diff --git a/lib/packages/wikibase/data-model-services/tests/bootstrap.php b/lib/packages/wikibase/data-model-services/tests/bootstrap.php
index b615a458cd8..881f5874121 100644
--- a/lib/packages/wikibase/data-model-services/tests/bootstrap.php
+++ b/lib/packages/wikibase/data-model-services/tests/bootstrap.php
@@ -11,7 +11,7 @@
 	die( 'Not an entry point' );
 }
 
-error_reporting( E_ALL | E_STRICT );
+error_reporting( E_ALL );
 ini_set( 'display_errors', 1 );
 
 if ( !is_readable( __DIR__ . '/../vendor/autoload.php' ) ) {
diff --git a/lib/packages/wikibase/data-model/tests/bootstrap.php b/lib/packages/wikibase/data-model/tests/bootstrap.php
index 7cd64f544c2..8a436857617 100644
--- a/lib/packages/wikibase/data-model/tests/bootstrap.php
+++ b/lib/packages/wikibase/data-model/tests/bootstrap.php
@@ -11,7 +11,7 @@
 	die( 'Not an entry point' );
 }
 
-error_reporting( E_ALL | E_STRICT );
+error_reporting( E_ALL );
 ini_set( 'display_errors', 1 );
 
 if ( !is_readable( __DIR__ . '/../vendor/autoload.php' ) ) {