diff --git a/src/Concise/Services/DataTypeChecker.php b/src/Concise/Services/DataTypeChecker.php
index d5fa7b37..1703267a 100644
--- a/src/Concise/Services/DataTypeChecker.php
+++ b/src/Concise/Services/DataTypeChecker.php
@@ -2,6 +2,8 @@
 
 namespace Concise\Services;
 
+use Closure;
+
 class DataTypeChecker
 {
     /**
@@ -118,7 +120,7 @@ protected function getType($value)
         if ($this->isAttribute($value)) {
             return $this->getType($this->getAttribute($value->getValue()));
         }
-        if (is_callable($value)) {
+        if ($value instanceof Closure) {
             return 'callable';
         }
 
diff --git a/tests/Concise/Services/DataTypeCheckerTest.php b/tests/Concise/Services/DataTypeCheckerTest.php
index b2f67c59..97948bc1 100644
--- a/tests/Concise/Services/DataTypeCheckerTest.php
+++ b/tests/Concise/Services/DataTypeCheckerTest.php
@@ -48,6 +48,7 @@ public function dataTypes()
             array(array("number"), 12.3),
             array(array("number"), '12.3'),
             array(array("bool"), true),
+            array(array("string"), 'count'),
         );
     }