diff --git a/os/src/boards/qemu.rs b/os/src/boards/qemu.rs
index 05527add4..f1f4e5638 100644
--- a/os/src/boards/qemu.rs
+++ b/os/src/boards/qemu.rs
@@ -1,6 +1,7 @@
 //! Constants used in rCore for qemu
 
 pub const CLOCK_FREQ: usize = 12500000;
+pub const MEMORY_END: usize = 0x8800_0000;
 
 pub const MMIO: &[(usize, usize)] = &[
     (0x0010_0000, 0x00_2000), // VIRT_TEST/RTC  in virt machine
diff --git a/os/src/config.rs b/os/src/config.rs
index e7dcee332..8c3c88fe5 100644
--- a/os/src/config.rs
+++ b/os/src/config.rs
@@ -3,7 +3,6 @@
 pub const USER_STACK_SIZE: usize = 4096 * 2;
 pub const KERNEL_STACK_SIZE: usize = 4096 * 2;
 pub const KERNEL_HEAP_SIZE: usize = 0x30_0000;
-pub const MEMORY_END: usize = 0x80800000;
 pub const PAGE_SIZE: usize = 0x1000;
 pub const PAGE_SIZE_BITS: usize = 0xc;
 
@@ -16,4 +15,4 @@ pub fn kernel_stack_position(app_id: usize) -> (usize, usize) {
     (bottom, top)
 }
 
-pub use crate::board::{CLOCK_FREQ, MMIO};
+pub use crate::board::{CLOCK_FREQ, MEMORY_END, MMIO};