diff --git a/WordPress/Sniffs/Security/EscapeOutputSniff.php b/WordPress/Sniffs/Security/EscapeOutputSniff.php
index 8a964cc020..b05732e823 100644
--- a/WordPress/Sniffs/Security/EscapeOutputSniff.php
+++ b/WordPress/Sniffs/Security/EscapeOutputSniff.php
@@ -438,7 +438,7 @@ public function process_matched_token( $stackPtr, $group_name, $matched_content
 
 			if ( false !== $file_param ) {
 				// Check for a particular code pattern which can safely be ignored.
-				if ( preg_match( '`^[\\\\]?basename\s*\(\s*__FILE__\s*\)$`', $file_param['clean'] ) === 1 ) {
+				if ( preg_match( '`^[\\\\]?basename\s*\(\s*__FILE__\s*\)$`i', $file_param['clean'] ) === 1 ) {
 					unset( $params[1], $params['file'] ); // Remove the param, whether passed positionally or named.
 				}
 			}
diff --git a/WordPress/Tests/Security/EscapeOutputUnitTest.1.inc b/WordPress/Tests/Security/EscapeOutputUnitTest.1.inc
index 5946578951..f744f385da 100644
--- a/WordPress/Tests/Security/EscapeOutputUnitTest.1.inc
+++ b/WordPress/Tests/Security/EscapeOutputUnitTest.1.inc
@@ -365,7 +365,7 @@ $obj = new User_Error( $foo ); // OK.
 
 // Make sure special casing of select functions is handled case-insensitively.
 Trigger_ERROR( 'This is fine', $second_param_should_be_ignored ); // OK.
-_Deprecated_File( basename( __FILE__ ), '1.3.0' ); // OK.
+_Deprecated_File( BASENAME( __file__ ), '1.3.0' ); // OK.
 _EX( 'all_params_should_be_ignored_if_function_is_reported_as_unsafe', 'another_param' ); // Bad x 1 for unsafe function.
 
 // Allow for comments in the $file parameter.