diff --git a/posix-runner/syscalls.c b/posix-runner/syscalls.c
index b2080d1..332ba8a 100644
--- a/posix-runner/syscalls.c
+++ b/posix-runner/syscalls.c
@@ -4,7 +4,8 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-void* syscall_table;
+void *syscall_table;
+void *_brk;
 
 int sys_read(int fd, char* buf, unsigned count, void, void, void)
 {
@@ -26,6 +27,23 @@ int sys_lseek(int fd, int offset, int whence, void, void, void)
     return lseek(fd, offset, whence);
 }
 
+int sys_brk(void* addr, void, void, void, void, void)
+{
+    if (_brk == NULL) {
+        _brk = calloc(1, 128 * 1024 * 1024);
+        if (_brk == NULL) {
+            return addr;
+        }
+    }
+    if (addr == NULL) {
+        return _brk;
+    }
+    else {
+        _brk = addr;
+        return _brk;
+    }
+}
+
 void sys_exit(unsigned value, void, void, void, void, void)
 {
     exit(value);
@@ -38,5 +56,6 @@ void init_syscalls()
     syscall_table[1] = sys_write;
     syscall_table[2] = sys_open;
     syscall_table[8] = sys_lseek;
+    syscall_table[12] = sys_brk;
     syscall_table[60] = sys_exit;
 }