diff --git a/lib/Form/TextInputStylesRenderer.php b/lib/Form/TextInputStylesRenderer.php
index 4f0cb883bd..8ca5014af0 100644
--- a/lib/Form/TextInputStylesRenderer.php
+++ b/lib/Form/TextInputStylesRenderer.php
@@ -11,6 +11,9 @@ class TextInputStylesRenderer {
     if (isset($styles['background_color'])) {
       $rules[] = "background-color:{$styles['background_color']};";
     }
+    if (isset($styles['border_size']) || isset($styles['border_radius']) || isset($styles['border_color'])) {
+      $rules[] = "border-style:solid;";
+    }
     if (isset($styles['border_radius'])) {
       $rules[] = "border-radius:" . intval($styles['border_radius']) . "px;";
     }
diff --git a/tests/unit/Form/TextInputStylesRendererTest.php b/tests/unit/Form/TextInputStylesRendererTest.php
index 74e5727971..400230238a 100644
--- a/tests/unit/Form/TextInputStylesRendererTest.php
+++ b/tests/unit/Form/TextInputStylesRendererTest.php
@@ -21,9 +21,9 @@ class TextInputStylesRendererTest extends \MailPoetUnitTest {
   }
 
   public function testItShouldRenderSingleStyles() {
-    expect($this->renderer->render(['border_radius' => 10]))->equals('border-radius:10px;');
-    expect($this->renderer->render(['border_color' => '#fff']))->equals('border-color:#fff;');
-    expect($this->renderer->render(['border_size' => 10]))->equals('border-width:10px;');
+    expect($this->renderer->render(['border_radius' => 10]))->equals('border-style:solid;border-radius:10px;');
+    expect($this->renderer->render(['border_color' => '#fff']))->equals('border-style:solid;border-color:#fff;');
+    expect($this->renderer->render(['border_size' => 10]))->equals('border-style:solid;border-width:10px;');
     expect($this->renderer->render(['background_color' => '#dddddd']))->equals('background-color:#dddddd;');
   }