diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index 7596e1e..7f65e71 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -115,7 +115,7 @@
 	current->flags |= PF_DUMPCORE;
        	strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
 #ifndef __sparc__
-	dump.u_ar0 = (void *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
+	dump.u_ar0 = offsetof(struct user, regs);
 #endif
 	dump.signal = signr;
 	dump_thread(regs, &dump);