diff --git a/client/cypress/e2e/frontend/instruments/instruments-page.spec.js b/client/cypress/e2e/frontend/instruments/instruments-page.spec.js
index b88823a2..478dd5dc 100644
--- a/client/cypress/e2e/frontend/instruments/instruments-page.spec.js
+++ b/client/cypress/e2e/frontend/instruments/instruments-page.spec.js
@@ -168,15 +168,15 @@ describe('Instruments Page', () => {
     cy.visit('instruments/');
 
     cy.get('.filter-bar__language-selection').invoke('show');
-    cy.getByDataCy('radio_button_de').click();
+    cy.getByDataCy('radio-button-de').click();
     cy.getByDataCy('instrument').should('have.length', 3);
 
-    cy.getByDataCy('radio_button_en').click();
+    cy.getByDataCy('radio-button-en').click();
     cy.getByDataCy('instrument').should('have.length', 0);
     cy.getByDataCy("info-message-no-entry").should('contain', 'Für die ausgewählten Filtereinstellungen sind keine Einträge vorhanden');
 
 
-    cy.getByDataCy('radio_button_fr').click();
+    cy.getByDataCy('radio-button-fr').click();
     cy.getByDataCy('instrument').should('have.length', 1);
   });
 });
diff --git a/client/src/components/ui/PillRadioButtons.vue b/client/src/components/ui/PillRadioButtons.vue
index 115239fb..2c5d9b1a 100644
--- a/client/src/components/ui/PillRadioButtons.vue
+++ b/client/src/components/ui/PillRadioButtons.vue
@@ -2,7 +2,7 @@
   <div class="pill-radio">
     <button
       :class="['pill-radio__button', { 'pill-radio__button--active': item === selectedItem }]"
-      :data-cy="'radio_button_' + item"
+      :data-cy="'radio-button-' + item"
       v-for="item in props.items"
       :key="item"
       @click="updateSelectedItem(item)"