diff --git a/src/DI/Compiler.php b/src/DI/Compiler.php
index 8f1bac2db..4e196ca14 100644
--- a/src/DI/Compiler.php
+++ b/src/DI/Compiler.php
@@ -46,6 +46,9 @@ class Compiler
 	/** @var string */
 	private $className = 'Container';
 
+	/** @var bool */
+	private $strictTypes = true;
+
 
 	public function __construct(ContainerBuilder $builder = null)
 	{
@@ -100,6 +103,17 @@ public function setClassName(string $className)
 	}
 
 
+	/**
+	 * Enables/disables declare(strict_types=1) in generated code.
+	 * @return static
+	 */
+	public function setStrictTypes(bool $on)
+	{
+		$this->strictTypes = $on;
+		return $this;
+	}
+
+
 	/**
 	 * Adds new configuration.
 	 * @return static
@@ -281,7 +295,7 @@ public function generateCode(): string
 
 		$this->builder->complete();
 
-		$generator = new PhpGenerator($this->builder);
+		$generator = new PhpGenerator($this->builder, $this->strictTypes);
 		$class = $generator->generate($this->className);
 		$this->dependencies->add($this->builder->getDependencies());
 
diff --git a/src/DI/PhpGenerator.php b/src/DI/PhpGenerator.php
index 9b4ff9ef2..8b820e3ab 100644
--- a/src/DI/PhpGenerator.php
+++ b/src/DI/PhpGenerator.php
@@ -29,10 +29,25 @@ class PhpGenerator
 	/** @var string */
 	private $className;
 
+	/** @var bool */
+	private $strictTypes = true;
 
-	public function __construct(ContainerBuilder $builder)
+
+	public function __construct(ContainerBuilder $builder, bool $strictTypes = true)
 	{
 		$this->builder = $builder;
+		$this->strictTypes = $strictTypes;
+	}
+
+
+	/**
+	 * Enables/disables declare(strict_types=1) in generated code.
+	 * @return static
+	 */
+	public function setStrictTypes(bool $on)
+	{
+		$this->strictTypes = $on;
+		return $this;
 	}
 
 
@@ -76,7 +91,7 @@ public function toString(Php\ClassType $class): string
 	{
 		return '/** @noinspection PhpParamsInspection,PhpMethodMayBeStaticInspection */
 
-declare(strict_types=1);
+' . ($this->strictTypes ? 'declare(strict_types=1);' : '') . '
 
 ' . $class->__toString();
 	}