diff --git a/src/osd/modules/debugger/qt/debuggerview.cpp b/src/osd/modules/debugger/qt/debuggerview.cpp
index 67389efc0af..150ca8519c5 100644
--- a/src/osd/modules/debugger/qt/debuggerview.cpp
+++ b/src/osd/modules/debugger/qt/debuggerview.cpp
@@ -10,6 +10,9 @@
 
 #include "modules/lib/osdobj_common.h"
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
+#define horizontalAdvance width
+#endif
 
 DebuggerView::DebuggerView(const debug_view_type& type,
 							running_machine* machine,
diff --git a/src/osd/modules/debugger/qt/memorywindow.cpp b/src/osd/modules/debugger/qt/memorywindow.cpp
index e9fc36b7a8f..2124effcbbd 100644
--- a/src/osd/modules/debugger/qt/memorywindow.cpp
+++ b/src/osd/modules/debugger/qt/memorywindow.cpp
@@ -18,6 +18,9 @@
 #include "debug/debugcon.h"
 #include "debug/debugcpu.h"
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
+#define horizontalAdvance width
+#endif
 
 MemoryWindow::MemoryWindow(running_machine* machine, QWidget* parent) :
 	WindowQt(machine, nullptr)