diff --git a/user/src/bin/forktest.rs b/user/src/bin/forktest.rs
index fea6967c..a7d523a8 100644
--- a/user/src/bin/forktest.rs
+++ b/user/src/bin/forktest.rs
@@ -6,7 +6,7 @@ extern crate user_lib;
 
 use user_lib::{fork, wait, exit};
 
-const MAX_CHILD: usize = 40;
+const MAX_CHILD: usize = 30;
 
 #[no_mangle]
 pub fn main() -> i32 {
@@ -31,4 +31,4 @@ pub fn main() -> i32 {
     }
     println!("forktest pass.");
     0
-}
\ No newline at end of file
+}
diff --git a/user/src/bin/matrix.rs b/user/src/bin/matrix.rs
index 8ef2c044..8f1357ea 100644
--- a/user/src/bin/matrix.rs
+++ b/user/src/bin/matrix.rs
@@ -6,7 +6,7 @@ extern crate user_lib;
 
 use user_lib::{fork, wait, yield_, exit, getpid, get_time};
 
-static NUM: usize = 35;
+static NUM: usize = 30;
 const N: usize = 10;
 static P: i32 = 10007;
 type Arr = [[i32; N]; N];
@@ -65,4 +65,4 @@ pub fn main() -> i32 {
     assert!(wait(&mut exit_code) < 0);
     println!("matrix passed.");
     0
-}
\ No newline at end of file
+}