diff --git a/graphene/validation/disable_introspection.py b/graphene/validation/disable_introspection.py
index 4c83050e..be25a287 100644
--- a/graphene/validation/disable_introspection.py
+++ b/graphene/validation/disable_introspection.py
@@ -8,12 +8,10 @@ from ..utils.is_introspection_key import is_introspection_key
 class DisableIntrospection(ValidationRule):
     def enter_field(self, node: FieldNode, *_args):
         field_name = node.name.value
-        if not is_introspection_key(field_name):
-            return
-
-        self.report_error(
-            GraphQLError(
-                f"Cannot query '{field_name}': introspection is disabled.",
-                node,
+        if is_introspection_key(field_name):
+            self.report_error(
+                GraphQLError(
+                    f"Cannot query '{field_name}': introspection is disabled.",
+                    node,
+                )
             )
-        )