diff --git a/hc/lib/jsonschema.py b/hc/lib/jsonschema.py
index 86f2df35..53e33371 100644
--- a/hc/lib/jsonschema.py
+++ b/hc/lib/jsonschema.py
@@ -16,6 +16,8 @@ def validate(obj, schema, obj_name="value"):
     if schema.get("type") == "string":
         if not isinstance(obj, str):
             raise ValidationError("%s is not a string" % obj_name)
+        if "minLength" in schema and len(obj) < schema["minLength"]:
+            raise ValidationError("%s is too short" % obj_name)
         if "maxLength" in schema and len(obj) > schema["maxLength"]:
             raise ValidationError("%s is too long" % obj_name)
         if schema.get("format") == "cron":
diff --git a/hc/lib/tests/test_jsonschema.py b/hc/lib/tests/test_jsonschema.py
index d51a120c..88a08990 100644
--- a/hc/lib/tests/test_jsonschema.py
+++ b/hc/lib/tests/test_jsonschema.py
@@ -12,6 +12,10 @@ class JsonSchemaTestCase(TestCase):
         with self.assertRaises(ValidationError):
             validate(123, {"type": "string"})
 
+    def test_it_checks_string_min_length(self):
+        with self.assertRaises(ValidationError):
+            validate("abcd", {"type": "string", "minLength": 5})
+
     def test_it_checks_string_length(self):
         with self.assertRaises(ValidationError):
             validate("abcd", {"type": "string", "maxLength": 3})