diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index 9c93000..d99c9dd 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -334,7 +334,7 @@ public function uninstall(array $module_list, $uninstall_dependents = TRUE) {
         $reason_message[] = implode(', ', $reason);
       }
       throw new ModuleUninstallValidatorException(format_string('The following reasons prevents the modules from being uninstalled: @reasons', array(
-        '@reasons' => implode(', ', $reason_message),
+        '@reasons' => implode('; ', $reason_message),
       )));
     }
     // Set the actual module weights.
diff --git a/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php b/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php
index f427ade..0bed70b 100644
--- a/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php
+++ b/core/modules/system/src/Tests/Field/FieldModuleUninstallValidatorTest.php
@@ -83,7 +83,7 @@ public function testUninstallingModule() {
     }
     catch (ModuleUninstallValidatorException $e) {
       $this->pass($message);
-      $this->assertEqual($e->getMessage(), 'The following reasons prevents the modules from being uninstalled: There is data for the field extra_base_field on entity type Test entity.');
+      $this->assertEqual($e->getMessage(), 'The following reasons prevents the modules from being uninstalled: There is data for the field extra_base_field on entity type Test entity');
     }
 
     // Verify uninstalling entity_test is not possible when there is content for