diff --git a/src/lisp/gc.c b/src/lisp/gc.c
index 826cd02..e3fc231 100644
--- a/src/lisp/gc.c
+++ b/src/lisp/gc.c
@@ -95,6 +95,16 @@
 
 				break;
 			}
+			case CLASS_TAG: {
+				struct class_alloc *class = (void *)alloc;
+
+				for (int i = 0; i < class->class.num_members; i++)
+				{
+					_mark(class->class.members[i], marked);
+				}
+
+				break;
+			}
 			}
 		}
 	}