diff --git a/src/modules/partition/gui/EditExistingPartitionDialog.cpp b/src/modules/partition/gui/EditExistingPartitionDialog.cpp
index f9e3a7c41..42da6ae41 100644
--- a/src/modules/partition/gui/EditExistingPartitionDialog.cpp
+++ b/src/modules/partition/gui/EditExistingPartitionDialog.cpp
@@ -114,6 +114,14 @@ EditExistingPartitionDialog::EditExistingPartitionDialog( Device* device, Partit
 EditExistingPartitionDialog::~EditExistingPartitionDialog()
 {}
 
+void
+EditExistingPartitionDialog::done( int r )
+{
+    // Avoid emitting editingFinished when losing focus
+    m_ui->sizeSpinBox->blockSignals( true );
+    QDialog::done( r );
+}
+
 
 PartitionTable::Flags
 EditExistingPartitionDialog::newFlags() const
diff --git a/src/modules/partition/gui/EditExistingPartitionDialog.h b/src/modules/partition/gui/EditExistingPartitionDialog.h
index 0aa89bb98..4bd8274a3 100644
--- a/src/modules/partition/gui/EditExistingPartitionDialog.h
+++ b/src/modules/partition/gui/EditExistingPartitionDialog.h
@@ -43,6 +43,8 @@ public:
     EditExistingPartitionDialog( Device* device, Partition* partition, QWidget* parentWidget = nullptr );
     ~EditExistingPartitionDialog();
 
+    void done( int r ) override;
+
     void applyChanges( PartitionCoreModule* module );
 
 private: