diff --git a/lib/ui/add_page/widgets/confirmation_popup.dart b/lib/ui/add_page/widgets/confirmation_popup.dart
index 980ddee..776dc5b 100644
--- a/lib/ui/add_page/widgets/confirmation_popup.dart
+++ b/lib/ui/add_page/widgets/confirmation_popup.dart
@@ -82,6 +82,7 @@ class _ConfirmationPopupState extends State<ConfirmationPopup> {
                       ),
                       keyboardType: TextInputType.numberWithOptions(
                         decimal: true,
+                        signed: true,
                       ),
                       validator: (value) {
                         if (value == null || value.isEmpty) {
diff --git a/lib/ui/add_page/widgets/form_popup.dart b/lib/ui/add_page/widgets/form_popup.dart
index 59368e0..2a3f1de 100644
--- a/lib/ui/add_page/widgets/form_popup.dart
+++ b/lib/ui/add_page/widgets/form_popup.dart
@@ -279,6 +279,7 @@ class _FullyManualState extends State<_FullyManual> {
                         ),
                         keyboardType: TextInputType.numberWithOptions(
                           decimal: true,
+                          signed: true,
                         ),
                         validator: (value) {
                           if (value == null || value.isEmpty) {
diff --git a/lib/ui/sell_page/widgets/sell_page.dart b/lib/ui/sell_page/widgets/sell_page.dart
index ee151e7..e7832b1 100644
--- a/lib/ui/sell_page/widgets/sell_page.dart
+++ b/lib/ui/sell_page/widgets/sell_page.dart
@@ -129,6 +129,7 @@ class _SellPageState extends State<SellPage> {
                               ),
                               keyboardType: TextInputType.numberWithOptions(
                                 decimal: true,
+                                signed: true,
                               ),
                             ),
                           ),