diff --git a/src/Value/CSSFunction.php b/src/Value/CSSFunction.php
index 14992aa8..c7024ea5 100644
--- a/src/Value/CSSFunction.php
+++ b/src/Value/CSSFunction.php
@@ -4,6 +4,9 @@
 
 use Sabberworm\CSS\OutputFormat;
 use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Parsing\SourceException;
+use Sabberworm\CSS\Parsing\UnexpectedEOFException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 
 /**
  * A `CSSFunction` represents a special kind of value that also contains a function name and where the values are the