diff --git a/src/Factory/ValueAssigner/ValueAssigner.php b/src/Factory/ValueAssigner/ValueAssigner.php
index cef5a5b..e098f96 100644
--- a/src/Factory/ValueAssigner/ValueAssigner.php
+++ b/src/Factory/ValueAssigner/ValueAssigner.php
@@ -134,6 +134,8 @@ protected function assignEntityValueFromRepository(RequestParameterList $request
 
     protected function convertToInt(string $stringValue, string $parameterName): int
     {
+        $stringValue = trim($stringValue);
+
         if (!preg_match('/^-?\d+$/', $stringValue)) {
             throw new \InvalidArgumentException(sprintf('Parameter "%s" is not a valid integer: "%s"', $parameterName, $stringValue));
         }
diff --git a/tests/Factory/ValueAssigner/ValueAssignerTest.php b/tests/Factory/ValueAssigner/ValueAssignerTest.php
index 21d3022..54e335b 100644
--- a/tests/Factory/ValueAssigner/ValueAssignerTest.php
+++ b/tests/Factory/ValueAssigner/ValueAssignerTest.php
@@ -272,4 +272,41 @@ public function testConvertToIntAcceptsNegativeNumber(): void
 
         $this->assertTrue(true);
     }
+
+    public function testConvertToIntTrimsWhitespace(): void
+    {
+        $list = new RequestParameterList();
+        $list->add('fromDateTime', ' 1711922400');
+
+        $query = new \MalteHuebner\DataQueryBundle\Query\FromDateTimeQuery();
+
+        $queryField = new QueryField();
+        $queryField
+            ->setMethodName('setFromDateTime')
+            ->setParameterName('fromDateTime')
+            ->setType(ValueType::INT);
+
+        $this->valueAssigner->assignQueryPropertyValueFromRequest($list, $query, $queryField);
+
+        $this->assertTrue(true);
+    }
+
+    public function testConvertToIntTrimsWhitespaceForParameter(): void
+    {
+        $list = new RequestParameterList();
+        $list->add('size', ' 25 ');
+
+        $parameter = new SizeParameter();
+        $parameter->setEntityFqcn('App\\Entity\\Test');
+
+        $parameterField = new ParameterField();
+        $parameterField
+            ->setMethodName('setSize')
+            ->setParameterName('size')
+            ->setType(ValueType::INT);
+
+        $this->valueAssigner->assignParameterPropertyValueFromRequest($list, $parameter, $parameterField);
+
+        $this->assertTrue(true);
+    }
 }