diff --git a/fillpdf.install b/fillpdf.install
index 5a1cc232d9e8bae7b8bfce366718a881080032c2..bdc1f4fbce8da93eba0180c588741861bed61728 100644
--- a/fillpdf.install
+++ b/fillpdf.install
@@ -70,6 +70,7 @@ function fillpdf_schema() {
       'pdf_key' => array(
         'type' => 'varchar',
         'length' => 255,
+        'binary' => TRUE,
         'not null' => TRUE,
       ),
       'label' => array(
@@ -398,3 +399,15 @@ function fillpdf_update_7107() {
     'length' => 255,
   ));
 }
+
+/**
+ * Mark {fillpdf_fields}.pdf_key BINARY to make it behave case-sensitive.
+ */
+function fillpdf_update_7108() {
+  db_change_field('fillpdf_fields', 'pdf_key', 'pdf_key', array(
+    'type' => 'varchar',
+    'length' => 255,
+    'binary' => TRUE,
+    'not null' => TRUE,
+  ));
+}
diff --git a/fillpdf.module b/fillpdf.module
index 6a8aad0195c11db8b1b69059434080878fafb6be..78c0cb3eddeaac9c5bdeda4fde5093b2933bfb58 100644
--- a/fillpdf.module
+++ b/fillpdf.module
@@ -1783,8 +1783,14 @@ function fillpdf_execute_parse($method, $fillpdf, $mode = 'url') {
           'value' => '',
           'type' => 'Text',
         ),
-        // Test duplicate name.
+        // Test field name only different in case.
         3 => array(
+          'name' => 'textfield',
+          'value' => '',
+          'type' => 'Text',
+        ),
+        // Test duplicate field name that should be consolidated.
+        4 => array(
           'name' => 'ImageField',
           'value' => '',
           'type' => 'Pushbutton',
diff --git a/tests/FillPdfTestHelper.test b/tests/FillPdfTestHelper.test
index c8681cf730a7a7797a2c0a76bf616fd07038ddbe..12c2d3799e6fd2bea7dd861c5d9288064724d98b 100644
--- a/tests/FillPdfTestHelper.test
+++ b/tests/FillPdfTestHelper.test
@@ -41,7 +41,7 @@ trait FillPdfTestHelper {
       'files[upload_pdf]' => drupal_realpath(drupal_get_path('module', 'fillpdf') . '/tests/fillpdf_test_v4.pdf'),
     ), t('Upload'));
     $this->assertText('fillpdf_test_v4.pdf was successfully uploaded.');
-    $this->assertResponse(200, "The duplicate field is consolidated and doesn't lead to an integrity constraint violation.");
+    $this->assertResponse(200, 'No integrity constraint violation.');
   }
 
   /**