diff --git a/src/include/86box/video.h b/src/include/86box/video.h
index a9e21acc8..3bf703099 100644
--- a/src/include/86box/video.h
+++ b/src/include/86box/video.h
@@ -139,6 +139,7 @@ typedef struct monitor_t {
     int                      mon_cga_palette_static; /* Whether it should not be freed by the API. */
     const video_timings_t   *mon_vid_timings;
     int                      mon_vid_type;
+    atomic_bool              mon_interlace;
     struct blit_data_struct *mon_blit_data_ptr;
 } monitor_t;
 
diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 8af112bda..7a6030e39 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -196,7 +196,7 @@ MainWindow::MainWindow(QWidget *parent)
     frameRateTimer->setInterval(1000);
     frameRateTimer->setSingleShot(false);
     connect(frameRateTimer, &QTimer::timeout, [this, hertz_label] {
-        hertz_label->setText(tr("%1 Hz").arg(monitors[0].mon_actualrenderedframes.load()));
+        hertz_label->setText(tr("%1 Hz").arg(QString::number(monitors[0].mon_actualrenderedframes.load()) + (monitors[0].mon_interlace ? "i" : "")));
     });
     statusBar()->addPermanentWidget(hertz_label);
     frameRateTimer->start(1000);
diff --git a/src/qt/qt_rendererstack.cpp b/src/qt/qt_rendererstack.cpp
index 96b286cfc..ade27d831 100644
--- a/src/qt/qt_rendererstack.cpp
+++ b/src/qt/qt_rendererstack.cpp
@@ -105,7 +105,7 @@ RendererStack::RendererStack(QWidget *parent, int monitor_index)
         frameRateTimer->setSingleShot(false);
         frameRateTimer->setInterval(1000);
         connect(frameRateTimer, &QTimer::timeout, [this] {
-            this->setWindowTitle(QObject::tr("86Box Monitor #") + QString::number(m_monitor_index + 1) + QString(" - ") + tr("%1 Hz").arg(monitors[m_monitor_index].mon_actualrenderedframes.load()));
+            this->setWindowTitle(QObject::tr("86Box Monitor #") + QString::number(m_monitor_index + 1) + QString(" - ") + tr("%1 Hz").arg(QString::number(monitors[m_monitor_index].mon_actualrenderedframes.load()) + (monitors[m_monitor_index].mon_interlace ? "i" : "")));
         });
         frameRateTimer->start(1000);
     }
diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index 2b9b612b2..21ea23c93 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -1146,6 +1146,7 @@ svga_recalctimings(svga_t *svga)
                 if (dev->dispofftime < TIMER_USEC)
                     dev->dispofftime = TIMER_USEC;
 
+                svga->monitor->mon_interlace = !!dev->interlace;
                 ibm8514_set_poll(svga);
             } else
                 svga_set_poll(svga);
@@ -1164,6 +1165,7 @@ svga_recalctimings(svga_t *svga)
                 if (xga->dispofftime < TIMER_USEC)
                     xga->dispofftime = TIMER_USEC;
 
+                svga->monitor->mon_interlace = !!xga->interlace;
                 xga_set_poll(svga);
             } else
                 svga_set_poll(svga);
@@ -1182,6 +1184,7 @@ svga_recalctimings(svga_t *svga)
                 if (dev->dispofftime < TIMER_USEC)
                     dev->dispofftime = TIMER_USEC;
 
+                svga->monitor->mon_interlace = !!dev->interlace;
                 ibm8514_set_poll(svga);
             } else if (xga->on) {
                 _dispofftime_xga = disptime_xga - _dispontime_xga;
@@ -1195,6 +1198,7 @@ svga_recalctimings(svga_t *svga)
                 if (xga->dispofftime < TIMER_USEC)
                     xga->dispofftime = TIMER_USEC;
 
+                svga->monitor->mon_interlace = !!xga->interlace;
                 xga_set_poll(svga);
             } else
                 svga_set_poll(svga);
@@ -1247,6 +1251,10 @@ svga_recalctimings(svga_t *svga)
         else
             svga->hdisp >>= 1;
     }
+
+    svga->monitor->mon_interlace = 0;
+    if (!svga->override && svga->interlace)
+        svga->monitor->mon_interlace = 1;
 }
 
 static void
diff --git a/src/video/vid_table.c b/src/video/vid_table.c
index 037f2a16c..6d3e70832 100644
--- a/src/video/vid_table.c
+++ b/src/video/vid_table.c
@@ -332,6 +332,8 @@ video_prepare(void)
         /* Do an inform on the default values, so that that there's some sane values initialized
            even if the device init function does not do an inform of its own. */
         video_inform_monitor(VIDEO_FLAG_TYPE_SPECIAL, &timing_default, i);
+
+        monitors[i].mon_interlace = 0;
     }
 }