diff --git a/src/qt/qt_harddiskdialog.cpp b/src/qt/qt_harddiskdialog.cpp
index 91179cdbc..3040db9c3 100644
--- a/src/qt/qt_harddiskdialog.cpp
+++ b/src/qt/qt_harddiskdialog.cpp
@@ -39,6 +39,7 @@ extern "C" {
 #include <QPushButton>
 #include <QStringBuilder>
 #include <QStringList>
+#include <QTimer>
 
 #include "qt_harddrive_common.hpp"
 #include "qt_settings_bus_tracking.hpp"
@@ -608,6 +609,7 @@ void HarddiskDialog::onExistingFileSelected(const QString &fileName) {
 }
 
 void HarddiskDialog::recalcSize() {
+    if (disallowSizeModifications) return;
     uint64_t size = (static_cast<uint64_t>(cylinders_) * static_cast<uint64_t>(heads_) * static_cast<uint64_t>(sectors_)) << 9;
     ui->lineEditSize->setText(QString::number(size >> 20));
 }
@@ -731,6 +733,7 @@ void HarddiskDialog::on_comboBoxBus_currentIndexChanged(int index) {
 }
 
 void HarddiskDialog::on_lineEditSize_textEdited(const QString &text) {
+    disallowSizeModifications = true;
     uint32_t size = text.toUInt();
     /* This is needed to ensure VHD standard compliance. */
     hdd_image_calc_chs(&cylinders_, &heads_, &sectors_, size);
@@ -742,6 +745,8 @@ void HarddiskDialog::on_lineEditSize_textEdited(const QString &text) {
     checkAndAdjustCylinders();
     checkAndAdjustHeads();
     checkAndAdjustSectors();
+
+    disallowSizeModifications = false;
 }
 
 void HarddiskDialog::on_lineEditCylinders_textEdited(const QString &text) {
diff --git a/src/qt/qt_harddiskdialog.hpp b/src/qt/qt_harddiskdialog.hpp
index 408726f63..f876d35dd 100644
--- a/src/qt/qt_harddiskdialog.hpp
+++ b/src/qt/qt_harddiskdialog.hpp
@@ -49,6 +49,8 @@ private:
     uint32_t max_sectors = 0;
     uint32_t max_heads = 0;
     uint32_t max_cylinders = 0;
+    
+    bool disallowSizeModifications = false;
 
     bool checkAndAdjustCylinders();
     bool checkAndAdjustHeads();