diff --git a/src/cpu/callback.cpp b/src/cpu/callback.cpp
index 3524c2f3..385a0c8c 100644
--- a/src/cpu/callback.cpp
+++ b/src/cpu/callback.cpp
@@ -65,7 +65,7 @@ void CALLBACK_Idle(void) {
 	Bit16u oldcs=SegValue(cs);
 	Bit32u oldeip=reg_eip;
 	SegSet16(cs,CB_SEG);
-	reg_eip=call_idle*CB_SIZE;
+	reg_eip=CB_SOFFSET+call_idle*CB_SIZE;
 	DOSBOX_RunMachine();
 	reg_eip=oldeip;
 	SegSet16(cs,oldcs);