diff --git a/tryton/gui/window/view_form/widget_search/float.py b/tryton/gui/window/view_form/widget_search/float.py
index d5e1b684f2..560a63586f 100644
--- a/tryton/gui/window/view_form/widget_search/float.py
+++ b/tryton/gui/window/view_form/widget_search/float.py
@@ -45,6 +45,8 @@ class Float(Integer):
         position = widget.get_position()
         new_value = value[:position] + new_text + value[position:]
         try:
+            if new_value == '-':
+                return
             if len(str(int(locale.atof(new_value)))) > self.digits[0]:
                 widget.stop_emission('insert-text')
         except:
diff --git a/tryton/gui/window/view_form/widget_search/integer.py b/tryton/gui/window/view_form/widget_search/integer.py
index da88d62f21..013e7237d6 100644
--- a/tryton/gui/window/view_form/widget_search/integer.py
+++ b/tryton/gui/window/view_form/widget_search/integer.py
@@ -77,6 +77,8 @@ class Integer(Interface):
         position = widget.get_position()
         new_value = value[:position] + new_text + value[position:]
         try:
+            if new_value == '-':
+                return
             locale.atoi(new_value)
         except:
             widget.stop_emission('insert-text')