diff --git a/serde/src/private/ser.rs b/serde/src/private/ser.rs
index 70f33818..eb8cfc98 100644
--- a/serde/src/private/ser.rs
+++ b/serde/src/private/ser.rs
@@ -1124,7 +1124,7 @@ where
     }
 
     fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
-        Err(Self::bad_type(Unsupported::Unit))
+        Ok(())
     }
 
     fn serialize_unit_struct(self, _: &'static str) -> Result<Self::Ok, Self::Error> {