diff --git a/src/gui/partitionmanagerwidget.cpp b/src/gui/partitionmanagerwidget.cpp
index 3541752..899deef 100644
--- a/src/gui/partitionmanagerwidget.cpp
+++ b/src/gui/partitionmanagerwidget.cpp
@@ -669,20 +669,36 @@ bool PartitionManagerWidget::showInsertDialog(Partition& insertedPartition, qint
 		if (result != KDialog::Accepted)
 			return false;
 	}
-	else if (KMessageBox::warningContinueCancel(this,
-			i18nc("@info", "<para><warning>You are about to lose all data on partition "
-				"<filename>%1</filename>.</warning></para>"
-				"<para>Overwriting one partition with another (or with an image file) will "
-				"destroy all data on this target partition.</para>"
-				"<para>If you continue now and apply the resulting operation in the main "
-				"window, all data currently stored on <filename>%1</filename> will "
-				"unrecoverably be overwritten.</para>",
-				selectedPartition()->deviceNode()),
-			i18nc("@title:window", "Really Overwrite Existing Partition?"),
-			KGuiItem(i18nc("@action:button", "Overwrite Partition"), "arrow-right"),
-			KStandardGuiItem::cancel(),
-			"reallyOverwriteExistingPartition") == KMessageBox::Cancel)
-		return false;
+	else
+	{
+		if (selectedPartition()->capacity() > insertedPartition.fileSystem().maxCapacity())
+		{
+			KMessageBox::sorry(this, i18nc("@info",
+				"<para>The target partition is bigger than the source allows.</para>"
+				"<para>You are trying to paste a %2 partition onto an existing partition "
+				"that is bigger than %1, the maximum capacity of a %2 file system.</para>",
+				Capacity(insertedPartition.fileSystem().maxCapacity()).toString(Capacity::AppendUnit),
+				insertedPartition.fileSystem().name()
+				),
+				i18nc("@title:window", "Target Partition Too Big"));
+			return false;
+		}
+
+		if (KMessageBox::warningContinueCancel(this,
+				i18nc("@info", "<para><warning>You are about to lose all data on partition "
+					"<filename>%1</filename>.</warning></para>"
+					"<para>Overwriting one partition with another (or with an image file) will "
+					"destroy all data on this target partition.</para>"
+					"<para>If you continue now and apply the resulting operation in the main "
+					"window, all data currently stored on <filename>%1</filename> will "
+					"unrecoverably be overwritten.</para>",
+					selectedPartition()->deviceNode()),
+				i18nc("@title:window", "Really Overwrite Existing Partition?"),
+				KGuiItem(i18nc("@action:button", "Overwrite Partition"), "arrow-right"),
+				KStandardGuiItem::cancel(),
+				"reallyOverwriteExistingPartition") == KMessageBox::Cancel)
+			return false;
+	}
 
 	if (insertedPartition.length() < sourceLength)
 	{