diff --git a/app/Http/Requests/StoreImageAnnotations.php b/app/Http/Requests/StoreImageAnnotations.php
index 9456ee364..1db16b1de 100644
--- a/app/Http/Requests/StoreImageAnnotations.php
+++ b/app/Http/Requests/StoreImageAnnotations.php
@@ -47,16 +47,16 @@ public function authorize()
         $this->imageIds = $input->pluck('image_id')
             ->unique()
             // Filter because the IDs are validated *after* authorization and could be
-            // e.g. floats here.
-            ->filter(fn ($id) => is_int($id));
+            // e.g. random strings here.
+            ->filter(fn ($id) => is_numeric($id));
 
         $this->images = Image::findMany($this->imageIds, ['id', 'volume_id']);
 
         $labelIds = $input->pluck('label_id')
             ->unique()
             // Filter because the IDs are validated *after* authorization and could be
-            // e.g. floats here.
-            ->filter(fn ($id) => is_int($id));
+            // e.g. random strings here.
+            ->filter(fn ($id) => is_numeric($id));
 
         $this->labels = Label::findMany($labelIds)->keyBy('id');
 
diff --git a/tests/php/Http/Controllers/Api/ImageAnnotationBulkControllerTest.php b/tests/php/Http/Controllers/Api/ImageAnnotationBulkControllerTest.php
index 9c58972bd..285a63c0e 100644
--- a/tests/php/Http/Controllers/Api/ImageAnnotationBulkControllerTest.php
+++ b/tests/php/Http/Controllers/Api/ImageAnnotationBulkControllerTest.php
@@ -233,4 +233,36 @@ public function storeLimit($url)
         $this->postJson($url, $data)
             ->assertStatus(422);
     }
+
+    public function testStoreLabelIdIsString()
+    {
+        $this->beEditor();
+        $this->postJson('api/v1/annotations', [
+                [
+                    'image_id' => $this->annotation->image_id,
+                    'shape_id' => Shape::pointId(),
+                    'points' => [100, 100],
+                    'label_id' => strval($this->labelRoot()->id),
+                    'confidence' => 1.0,
+                ],
+            ])
+            ->assertStatus(200);
+
+        $this->assertEquals(2, $this->annotation->image->annotations()->count());
+    }
+
+    public function testStoreLabelIdIsFloat()
+    {
+        $this->beEditor();
+        $this->postJson('api/v1/annotations', [
+                [
+                    'image_id' => $this->annotation->image_id,
+                    'shape_id' => Shape::pointId(),
+                    'points' => [100, 100],
+                    'label_id' => 1.5,
+                    'confidence' => 1.0,
+                ],
+            ])
+            ->assertStatus(422);
+    }
 }