diff --git a/resources/sql/patches/105.mimetype.sql b/resources/sql/patches/105.mimetype.sql
new file mode 100644
index 0000000000..99f53a5580
--- /dev/null
+++ b/resources/sql/patches/105.mimetype.sql
@@ -0,0 +1,4 @@
+/* Prior to D1615, we used the raw output of `file` to determine mime types,
+   without stripping carriage returns. This creates Content-Type headers
+   which are blocked by response-splitting protections introduced in D1564. */
+UPDATE phabricator_file.file SET mimeType = TRIM(BOTH "\n" FROM mimeType);