diff --git a/coregrind/m_scheduler/scheduler.c b/coregrind/m_scheduler/scheduler.c
index 9bfc6ca..fd5a5ed 100644
--- a/coregrind/m_scheduler/scheduler.c
+++ b/coregrind/m_scheduler/scheduler.c
@@ -901,7 +901,7 @@
 #elif defined(VGA_amd64)
 #  define VG_CLREQ_ARGS       guest_RAX
 #  define VG_CLREQ_RET        guest_RDX
-#elif defined(VGA_ppc32)
+#elif defined(VGA_ppc32) || defined(VGA_ppc64)
 #  define VG_CLREQ_ARGS       guest_GPR4
 #  define VG_CLREQ_RET        guest_GPR3
 #else