diff --git a/tests/phpunit/unit/TexVC/Nodes/DeclhTest.php b/tests/phpunit/unit/TexVC/Nodes/DeclhTest.php
index d9882802c..372f614b8 100644
--- a/tests/phpunit/unit/TexVC/Nodes/DeclhTest.php
+++ b/tests/phpunit/unit/TexVC/Nodes/DeclhTest.php
@@ -70,9 +70,9 @@ class DeclhTest extends MediaWikiUnitTestCase {
 	public function testSubscriptsForFontMod() {
 		$mods = [ 'rm','it','cal','bf' ];
 		foreach ( $mods as $mod ) {
-			$f = new Declh( "\\${mod}", new TexArray( new Literal( 'a' ) ) );
-			$this->assertEquals( [ "\\math${mod}{a}" ], $f->extractSubscripts(),
-				"Should extract subscripts for ${mod} font modification" );
+			$f = new Declh( "\\{$mod}", new TexArray( new Literal( 'a' ) ) );
+			$this->assertEquals( [ "\\math{$mod}{a}" ], $f->extractSubscripts(),
+				"Should extract subscripts for {$mod} font modification" );
 		}
 	}
 }