diff --git a/ruma-api-macros/src/api/parse.rs b/ruma-api-macros/src/api/parse.rs
index fad0dcc7..0aa30235 100644
--- a/ruma-api-macros/src/api/parse.rs
+++ b/ruma-api-macros/src/api/parse.rs
@@ -84,7 +84,7 @@ impl Parse for Request {
                 let mut field_kind = None;
                 let mut header = None;
 
-                for attr in mem::replace(&mut field.attrs, Vec::new()) {
+                for attr in mem::take(&mut field.attrs) {
                     let meta = match Meta::from_attribute(&attr)? {
                         Some(m) => m,
                         None => {
@@ -231,7 +231,7 @@ impl Parse for Response {
                 let mut field_kind = None;
                 let mut header = None;
 
-                for attr in mem::replace(&mut field.attrs, Vec::new()) {
+                for attr in mem::take(&mut field.attrs) {
                     let meta = match Meta::from_attribute(&attr)? {
                         Some(m) => m,
                         None => {
diff --git a/ruma-signatures/src/functions.rs b/ruma-signatures/src/functions.rs
index ce098f70..3f0ecddc 100644
--- a/ruma-signatures/src/functions.rs
+++ b/ruma-signatures/src/functions.rs
@@ -721,7 +721,7 @@ pub fn redact(
             _ => return Err(Error::new("field `content` in JSON value must be a JSON object")),
         };
 
-        let mut old_content = mem::replace(content, BTreeMap::new());
+        let mut old_content = mem::take(content);
 
         for &key in allowed_content_keys {
             if let Some(value) = old_content.remove(key) {
@@ -730,7 +730,7 @@ pub fn redact(
         }
     }
 
-    let mut old_event = mem::replace(&mut event, BTreeMap::new());
+    let mut old_event = mem::take(&mut event);
 
     for &key in ALLOWED_KEYS {
         if let Some(value) = old_event.remove(key) {