diff --git a/ruma-api-macros/src/api.rs b/ruma-api-macros/src/api.rs
index 80cdf2b4..e854d332 100644
--- a/ruma-api-macros/src/api.rs
+++ b/ruma-api-macros/src/api.rs
@@ -20,7 +20,7 @@ use self::{metadata::Metadata, request::Request, response::Response};
 /// Removes `serde` attributes from struct fields.
 pub fn strip_serde_attrs(field: &Field) -> Field {
     let mut field = field.clone();
-    field.attrs.retain(|attr| attr.path.is_ident("serde"));
+    field.attrs.retain(|attr| !attr.path.is_ident("serde"));
     field
 }