diff --git a/CHANGELOG-v3.md b/CHANGELOG-v3.md
index f3bf5309a2f..48fd498a42c 100644
--- a/CHANGELOG-v3.md
+++ b/CHANGELOG-v3.md
@@ -22,6 +22,7 @@
 - Fixed a bug where the `--uid` option on `resave/*` console commands wasn’t working. ([#3941](https://github.com/craftcms/cms/issues/3941))
 - Fixed a SQL error that could occur when running `resave/*` console commands.
 - Fixed a PHP error that occurred when calling the deprecated `getError()` method on a model that had no errors. ([#3934](https://github.com/craftcms/cms/issues/3934))
+- Fixed a bug where new folder names would not be sanitized when created via asset manager. ([#3689](https://github.com/craftcms/cms/issues/3689))
 
 ## 3.1.15 - 2019-02-26
 
diff --git a/src/helpers/Assets.php b/src/helpers/Assets.php
index 625b4c12a44..e2901d6ca98 100644
--- a/src/helpers/Assets.php
+++ b/src/helpers/Assets.php
@@ -163,6 +163,10 @@ public static function prepareAssetName(string $name, bool $isFilename = true, b
             $baseName = '-';
         }
 
+        if (!$isFilename) {
+            $baseName = $baseNameSanitized;
+        }
+
         return $baseName . $extension;
     }