diff --git a/sao/src/theme/coog/sao.less b/sao/src/theme/coog/sao.less
index 2bd25c35f01..ccd3807f24e 100644
--- a/sao/src/theme/coog/sao.less
+++ b/sao/src/theme/coog/sao.less
@@ -561,7 +561,7 @@ div.form-boolean > input[type=checkbox].input-checkbox.form-control[readonly] {
 
 // increase minimum width of fields
 .form {
-    .form-char, .form-password, .form-integer, .form-float,
+    .form-password, .form-float,
     .form-datetime, .form-time, .form-timedelta, .form-selection,
     .form-multiselection, .form-url, .form-email, .form-callto, .form-sip,
     .form-pyson {
@@ -569,6 +569,14 @@ div.form-boolean > input[type=checkbox].input-checkbox.form-control[readonly] {
             min-width: 17ch;
         }
     }
+    .form-char, .form-integer {
+        input:not([size]) {
+            min-width: 17ch;
+        }
+        input[size] {
+            min-width: unset;
+        }
+    }
     .form-many2one, .form-one2one, .form-reference, form-binary {
         select {
             min-width: 15ch;
diff --git a/sao/src/view/form.js b/sao/src/view/form.js
index a4b1f6f43d9..50aada2dc23 100644
--- a/sao/src/view/form.js
+++ b/sao/src/view/form.js
@@ -2046,7 +2046,7 @@ function eval_pyson(value){
             if (record) {
                 length = record.expr_eval(this.attributes.size);
                 if (length > 0) {
-                    width = null;
+                    width = (length + 2) + 'ch';
                 }
             }
             this.input.val(this.get_client_value());
@@ -2489,7 +2489,8 @@ function eval_pyson(value){
             var value = '';
             if (this.width !== null){
                 this.input_text.css('width', this.width + 'ch');
-                this.input.css('width', (this.width + 5) + 'ch');
+                this.input.css('width', (this.width + 2) + 'ch');
+                this.group.css('width', (this.width + 2) + 'ch');
             }
             if (field) {
                 value = field.get_client(record, this.factor, this.grouping);