diff --git a/src/Writers/FunctionWriter.php b/src/Writers/FunctionWriter.php
index ee1e669..a8ab6ed 100644
--- a/src/Writers/FunctionWriter.php
+++ b/src/Writers/FunctionWriter.php
@@ -6,6 +6,8 @@
 use PhpParser\Node\Arg;
 use PhpParser\Node\Expr\FuncCall;
 use PhpParser\Node\Name;
+use PhpParser\Node\Scalar\Float_;
+use PhpParser\Node\Scalar\Int_;
 use PhpParser\Node\Scalar\String_;
 
 class FunctionWriter
@@ -85,7 +87,7 @@ private function convertToArgs($args)
     {
         return collect($args)
             ->reject(fn ($arg) => $arg === null || mb_strlen($arg) === 0)
-            ->map(fn (string $arg) => new Arg(new String_($arg)))
+            ->map(fn (mixed $arg) => $this->arg($arg))
             ->all();
     }
 
@@ -93,4 +95,20 @@ private function convertToName(string $name)
     {
         return new Name($name);
     }
+
+    private function scalarClass(string $type): string
+    {
+        return match ($type) {
+            'integer' => Int_::class,
+            'double' => Float_::class,
+            default => String_::class,
+        };
+    }
+
+    private function arg(mixed $arg): Arg
+    {
+        $scalarClass = $this->scalarClass(gettype($arg));
+
+        return new Arg(new $scalarClass($arg));
+    }
 }
diff --git a/tests/LaravelFunctionCallTest.php b/tests/LaravelFunctionCallTest.php
index ef78d26..7e1692f 100644
--- a/tests/LaravelFunctionCallTest.php
+++ b/tests/LaravelFunctionCallTest.php
@@ -60,7 +60,20 @@ public function testCustomCallsCanBeWritten()
         );
     }
 
+    public function testTypesAreMaintained()
+    {
+        $f = new FunctionWriter;
 
+        $this->assertChangeEquals(
+            __DIR__.'/configs/empty.php',
+            __DIR__.'/expected/typesenv.php',
+            [
+                'int_type' => $f->env('INTEGER_TYPE', 5),
+                'double_type' => $f->env('DOUBLE_TYPE', 5.0),
+                'string_type' => $f->env('STRING_TYPE', '5'),
+            ]
+        );
+    }
 
     public function testWritingNewClosuresOrArrowFunctions()
     {
diff --git a/tests/expected/typesenv.php b/tests/expected/typesenv.php
new file mode 100644
index 0000000..6fd4e77
--- /dev/null
+++ b/tests/expected/typesenv.php
@@ -0,0 +1,7 @@
+<?php
+
+return [
+    'int_type' => env('INTEGER_TYPE', 5),
+    'double_type' => env('DOUBLE_TYPE', 5.0),
+    'string_type' => env('STRING_TYPE', '5'),
+];