diff --git a/codes/c/chapter_computational_complexity/space_complexity.c b/codes/c/chapter_computational_complexity/space_complexity.c
index add3d8465..49485ddc8 100644
--- a/codes/c/chapter_computational_complexity/space_complexity.c
+++ b/codes/c/chapter_computational_complexity/space_complexity.c
@@ -106,8 +106,9 @@ int quadraticRecur(int n) {
         return 0;
     int *nums = malloc(sizeof(int) * n);
     printf("递归 n = %d 中的 nums 长度 = %d\r\n", n, n);
+    int res = quadraticRecur(n - 1)
     free(nums);
-    return quadraticRecur(n - 1);
+    return res;
 }
 
 /* 指数阶（建立满二叉树） */