diff --git a/lizmap/modules/lizmap/lib/Form/QgisFormControl.php b/lizmap/modules/lizmap/lib/Form/QgisFormControl.php
index 28c4ad05dd..9dab55ca45 100644
--- a/lizmap/modules/lizmap/lib/Form/QgisFormControl.php
+++ b/lizmap/modules/lizmap/lib/Form/QgisFormControl.php
@@ -506,14 +506,35 @@ protected function fillControlDatasource()
             case 'ValueMap':
                 $valueMap = $this->properties->getValueMap();
                 if (is_array($valueMap)) {
-                    // remove the QGIS null value if the control value is not
-                    // required, as the widget will have a possibility to choose
-                    // no value (so null value... ?)
-                    if (!$this->required
-                        && $this->fieldDataType == 'boolean'
-                        && isset($valueMap[self::QGIS_NULL_VALUE])
-                    ) {
-                        unset($valueMap[self::QGIS_NULL_VALUE]);
+                    // Override values for boolean
+                    if ($this->fieldDataType == 'boolean') {
+                        // remove the QGIS null value if the control value is not
+                        // required, as the widget will have a possibility to choose
+                        // no value (so null value... ?)
+                        if (!$this->required
+                            && isset($valueMap[self::QGIS_NULL_VALUE])
+                        ) {
+                            unset($valueMap[self::QGIS_NULL_VALUE]);
+                        }
+                        // transform values from QGIS ValueMap to Postgres Boolean
+                        $booleanValues = array();
+                        foreach ($valueMap as $v => $label) {
+                            $strV = strtolower($v);
+                            if ($v === self::QGIS_NULL_VALUE) {
+                                $booleanValues[self::QGIS_NULL_VALUE] = $label;
+                            } elseif ($strV === 'true' || $strV === 't'
+                                || intval($v) === 1 || $strV === 'on') {
+                                // Postgres true
+                                $booleanValues['t'] = $label;
+                            } elseif ($strV === 'false' || $strV === 'f'
+                                || intval($v) === 0 || $strV === 'off') {
+                                // Postgres false
+                                $booleanValues['f'] = $label;
+                            } else {
+                                $booleanValues[$strV] = $label;
+                            }
+                        }
+                        $valueMap = $booleanValues;
                     }
                     // we don't use array_merge, because this function reindexes keys if they are
                     // numerical values, and this is not what we want.
diff --git a/tests/end2end/cypress/integration/form_edition_all_field_type-ghaction.js b/tests/end2end/cypress/integration/form_edition_all_field_type-ghaction.js
index fce0961620..6d45ef8372 100644
--- a/tests/end2end/cypress/integration/form_edition_all_field_type-ghaction.js
+++ b/tests/end2end/cypress/integration/form_edition_all_field_type-ghaction.js
@@ -103,19 +103,6 @@ describe('Form edition all field type', function() {
         cy.get('#lizmap-edition-message').should('be.visible')
     })
 
-    it('boolean, dropdown menu', function () {
-        // `boolean_nullable` should show a dropdown menu with :
-        // * an empty value
-        cy.get('#jforms_view_edition_boolean_nullable').select('')
-        cy.get('#jforms_view_edition_boolean_nullable').should('have.value', '')
-        // * a true value
-        cy.get('#jforms_view_edition_boolean_nullable').select('True')
-        cy.get('#jforms_view_edition_boolean_nullable').should('have.value', 'true')
-        // * a false value
-        cy.get('#jforms_view_edition_boolean_nullable').select('False')
-        cy.get('#jforms_view_edition_boolean_nullable').should('have.value', 'false')
-    })
-
     it('boolean, not null', function () {
         cy.get('#jforms_view_edition_boolean_notnull_for_checkbox').should('have.class', 'jforms-ctrl-checkbox')
         cy.get('#jforms_view_edition__submit_submit').click()
diff --git a/tests/units/classes/Form/QgisFormControlTest.php b/tests/units/classes/Form/QgisFormControlTest.php
index e4fb9b4c9b..520b89d2b1 100644
--- a/tests/units/classes/Form/QgisFormControlTest.php
+++ b/tests/units/classes/Form/QgisFormControlTest.php
@@ -367,9 +367,9 @@ public function testConstructCheckbox()
         $this->assertEquals($control->fieldDataType, 'boolean');
         $this->assertEquals($control->fieldEditType, 'CheckBox');
         $this->assertEquals($control->ctrl->getWidgetType(), 'checkbox');
-        $this->assertEquals($control->ctrl->valueOnCheck, 'true');
+        $this->assertEquals($control->ctrl->valueOnCheck, 't');
         $this->assertEquals($control->ctrl->valueLabelOnCheck, 'Yes');
-        $this->assertEquals($control->ctrl->valueOnUncheck, 'false');
+        $this->assertEquals($control->ctrl->valueOnUncheck, 'f');
         $this->assertEquals($control->ctrl->valueLabelOnUncheck, 'No');
     }
 }