diff --git a/kernel/system/do_fork.c b/kernel/system/do_fork.c
index 4a1180cc6..248d18f7c 100644
--- a/kernel/system/do_fork.c
+++ b/kernel/system/do_fork.c
@@ -15,6 +15,7 @@
 #include <assert.h>
 
 #include <minix/endpoint.h>
+#include <minix/u64.h>
 
 #if USE_FORK
 
@@ -94,6 +95,9 @@ PUBLIC int do_fork(struct proc * caller, message * m_ptr)
   if (rpc->p_scheduler)
 	  RTS_SET(rpc, RTS_NO_QUANTUM);
 
+  make_zero64(rpc->p_cpu_time_left);
+  make_zero64(rpc->p_cycles);
+
   /* If the parent is a privileged process, take away the privileges from the 
    * child process and inhibit it from running by setting the NO_PRIV flag.
    * The caller should explicitely set the new privileges before executing.