diff --git a/Machines/Oric/Microdisc.cpp b/Machines/Oric/Microdisc.cpp
index ded159fa2..564d904e7 100644
--- a/Machines/Oric/Microdisc.cpp
+++ b/Machines/Oric/Microdisc.cpp
@@ -14,7 +14,7 @@ Microdisc::Microdisc() :
 	irq_enable_(false),
 	delegate_(nullptr),
 	paging_flags_(BASICDisable),
-	WD1770(P1773)
+	WD1770(P1793)
 {}
 
 void Microdisc::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive)