diff --git a/filetypes.xml b/filetypes.xml
index b79d395..4b2a578 100644
--- a/filetypes.xml
+++ b/filetypes.xml
@@ -5,6 +5,7 @@
       <mapping ext="gradle.kts" type="Kotlin" />
       <mapping ext="main.kts" type="Kotlin" />
       <mapping pattern=".gitkeep" type="PLAIN_TEXT" />
+      <mapping ext="o" type="PLAIN_TEXT" />
       <mapping ext="so" type="PLAIN_TEXT" />
       <removed_mapping ext="apk" approved="true" type="ARCHIVE" />
       <removed_mapping ext="ignore" approved="true" type="IgnoreLang file" />