diff --git a/src/ass_dialogue.cpp b/src/ass_dialogue.cpp
index 88ce9386a..518e4d4fe 100644
--- a/src/ass_dialogue.cpp
+++ b/src/ass_dialogue.cpp
@@ -118,7 +118,7 @@ void AssDialogue::Parse(std::string const& raw) {
 	Style = tkn.next_str_trim();
 	Actor = tkn.next_str_trim();
 	for (int& margin : Margin)
-		margin = mid(0, boost::lexical_cast<int>(tkn.next_str()), 9999);
+		margin = mid(-9999, boost::lexical_cast<int>(tkn.next_str()), 99999);
 	Effect = tkn.next_str_trim();
 
 	std::string text{tkn.next_tok().begin(), str.end()};
diff --git a/src/ass_style.cpp b/src/ass_style.cpp
index 37645c043..0b778b328 100644
--- a/src/ass_style.cpp
+++ b/src/ass_style.cpp
@@ -158,9 +158,9 @@ AssStyle::AssStyle(std::string const& str, int version) {
 	if (version == 0)
 		alignment = SsaToAss(alignment);
 
-	Margin[0] = mid(0, p.next_int(), 9999);
-	Margin[1] = mid(0, p.next_int(), 9999);
-	Margin[2] = mid(0, p.next_int(), 9999);
+	Margin[0] = mid(-9999, p.next_int(), 99999);
+	Margin[1] = mid(-9999, p.next_int(), 99999);
+	Margin[2] = mid(-9999, p.next_int(), 99999);
 
 	// Skip alpha level
 	if (version == 0)
diff --git a/src/dialog_style_editor.cpp b/src/dialog_style_editor.cpp
index 039caee17..b186e5fd7 100644
--- a/src/dialog_style_editor.cpp
+++ b/src/dialog_style_editor.cpp
@@ -200,7 +200,7 @@ DialogStyleEditor::DialogStyleEditor(wxWindow *parent, AssStyle *style, agi::Con
 	for (int i = 0; i < 3; i++)
 		margin[i] = new wxSpinCtrl(this, -1, std::to_wstring(style->Margin[i]),
 		                           wxDefaultPosition, wxSize(60, -1),
-		                           wxSP_ARROW_KEYS, 0, 9999, style->Margin[i]);
+		                           wxSP_ARROW_KEYS, -9999, 99999, style->Margin[i]);
 
 	Alignment = new wxRadioBox(this, -1, _("Alignment"), wxDefaultPosition, wxDefaultSize, 9, alignValues, 3, wxRA_SPECIFY_COLS);
 	auto Outline = num_text_ctrl(&work->outline_w, 0.0, 1000.0, 0.1);
diff --git a/src/subs_edit_box.cpp b/src/subs_edit_box.cpp
index a72204fdb..9c4bb1f49 100644
--- a/src/subs_edit_box.cpp
+++ b/src/subs_edit_box.cpp
@@ -250,13 +250,13 @@ SubsEditBox::~SubsEditBox() {
 }
 
 wxTextCtrl *SubsEditBox::MakeMarginCtrl(wxString const& tooltip, int margin, wxString const& commit_msg) {
-	wxTextCtrl *ctrl = new wxTextCtrl(this, -1, "", wxDefaultPosition, wxSize(40,-1), wxTE_CENTRE | wxTE_PROCESS_ENTER, IntValidator());
-	ctrl->SetMaxLength(4);
+	wxTextCtrl *ctrl = new wxTextCtrl(this, -1, "", wxDefaultPosition, wxSize(40,-1), wxTE_CENTRE | wxTE_PROCESS_ENTER, IntValidator(0, true));
+	ctrl->SetMaxLength(5);
 	ctrl->SetToolTip(tooltip);
 	middle_left_sizer->Add(ctrl, wxSizerFlags().Center());
 
 	Bind(wxEVT_TEXT, [=](wxCommandEvent&) {
-		int value = agi::util::mid(0, atoi(ctrl->GetValue().utf8_str()), 9999);
+		int value = agi::util::mid(-9999, atoi(ctrl->GetValue().utf8_str()), 99999);
 		SetSelectedRows([&](AssDialogue *d) { d->Margin[margin] = value; },
 			commit_msg, AssFile::COMMIT_DIAG_META);
 	}, ctrl->GetId());