diff --git a/machxo2/archdefs.h b/machxo2/archdefs.h
index 31575487..11791d3c 100644
--- a/machxo2/archdefs.h
+++ b/machxo2/archdefs.h
@@ -28,6 +28,9 @@ NEXTPNR_NAMESPACE_BEGIN
 
 typedef float delay_t;
 
+// https://bugreports.qt.io/browse/QTBUG-80789
+
+#ifndef Q_MOC_RUN
 enum ConstIds
 {
     ID_NONE
@@ -41,6 +44,7 @@ enum ConstIds
 #define X(t) static constexpr auto id_##t = IdString(ID_##t);
 #include "constids.inc"
 #undef X
+#endif
 
 NPNR_PACKED_STRUCT(struct LocationPOD { int16_t x, y; });