diff --git a/src/Container/Definition/AbstractDefinition.php b/src/Container/Definition/AbstractDefinition.php
index d8be2fc..d79ea8a 100644
--- a/src/Container/Definition/AbstractDefinition.php
+++ b/src/Container/Definition/AbstractDefinition.php
@@ -10,6 +10,8 @@
 use WoohooLabs\Zen\Container\DefinitionCompilation;
 
 use function array_key_exists;
+use function array_reduce;
+use function explode;
 use function str_repeat;
 use function str_replace;
 
diff --git a/src/Container/Definition/ClassDefinition.php b/src/Container/Definition/ClassDefinition.php
index a500ac7..14d7306 100644
--- a/src/Container/Definition/ClassDefinition.php
+++ b/src/Container/Definition/ClassDefinition.php
@@ -10,6 +10,7 @@
 
 use function array_key_exists;
 use function array_keys;
+use function preg_replace;
 use function var_export;
 
 class ClassDefinition extends AbstractDefinition