diff --git a/crates/crates-io/lib.rs b/crates/crates-io/lib.rs
index 00cc3e0590b..becd02af8d8 100644
--- a/crates/crates-io/lib.rs
+++ b/crates/crates-io/lib.rs
@@ -149,41 +149,15 @@ impl Registry {
     pub fn add_owners(&mut self, krate: &str, owners: &[&str]) -> Result<String> {
         let body = serde_json::to_string(&OwnersReq { users: owners })?;
         let body = self.put(&format!("/crates/{}/owners", krate), body.as_bytes())?;
-        let body = if body.is_empty() {
-            r#"{"ok":false,"msg":"response body is empty"}"#.parse()?
-        } else {
-            body
-        };
-        match serde_json::from_str::<OwnerResponse>(&body) {
-            Ok(response) => {
-                if response.ok {
-                    Ok(response.msg)
-                } else {
-                    bail!("{}", response.msg)
-                }
-            }
-            _ => bail!("failed to parse response body"),
-        }
+        assert!(serde_json::from_str::<OwnerResponse>(&body)?.ok);
+        Ok(serde_json::from_str::<OwnerResponse>(&body)?.msg)
     }
 
-    pub fn remove_owners(&mut self, krate: &str, owners: &[&str]) -> Result<String> {
+    pub fn remove_owners(&mut self, krate: &str, owners: &[&str]) -> Result<()> {
         let body = serde_json::to_string(&OwnersReq { users: owners })?;
         let body = self.delete(&format!("/crates/{}/owners", krate), Some(body.as_bytes()))?;
-        let body = if body.is_empty() {
-            r#"{"ok":false,"msg":"response body is empty"}"#.parse()?
-        } else {
-            body
-        };
-        match serde_json::from_str::<OwnerResponse>(&body) {
-            Ok(response) => {
-                if response.ok {
-                    Ok(response.msg)
-                } else {
-                    bail!("{}", response.msg)
-                }
-            }
-            _ => bail!("failed to parse response body"),
-        }
+        assert!(serde_json::from_str::<OwnerResponse>(&body)?.ok);
+        Ok(())
     }
 
     pub fn list_owners(&mut self, krate: &str) -> Result<Vec<User>> {
@@ -298,21 +272,8 @@ impl Registry {
 
     pub fn unyank(&mut self, krate: &str, version: &str) -> Result<()> {
         let body = self.put(&format!("/crates/{}/{}/unyank", krate, version), &[])?;
-        let body = if body.is_empty() {
-            r#"{"ok":false}"#.parse()?
-        } else {
-            body
-        };
-        match serde_json::from_str::<R>(&body) {
-            Ok(response) => {
-                if response.ok {
-                    Ok(())
-                } else {
-                    bail!("ok is false in response body")
-                }
-            }
-            _ => bail!("failed to parse response body"),
-        }
+        assert!(serde_json::from_str::<R>(&body)?.ok);
+        Ok(())
     }
 
     fn put(&mut self, path: &str, b: &[u8]) -> Result<String> {
diff --git a/tests/testsuite/owner.rs b/tests/testsuite/owner.rs
index d37206b206a..03a987d72db 100644
--- a/tests/testsuite/owner.rs
+++ b/tests/testsuite/owner.rs
@@ -76,7 +76,7 @@ fn simple_add() {
         .with_status(101)
         .with_stderr(
             "    Updating `[..]` index
-error: failed to invite owners to crate foo: response body is empty",
+error: failed to invite owners to crate foo: EOF while parsing a value at line 1 column 0",
         )
         .run();
 }
@@ -110,7 +110,7 @@ fn simple_remove() {
 error: failed to remove owners from crate foo
 
 Caused by:
-  response body is empty",
+  EOF while parsing a value at line 1 column 0",
         )
         .run();
 }
diff --git a/tests/testsuite/yank.rs b/tests/testsuite/yank.rs
index 83c118be80d..c697825320d 100644
--- a/tests/testsuite/yank.rs
+++ b/tests/testsuite/yank.rs
@@ -45,7 +45,7 @@ fn simple() {
 error: failed to undo a yank
 
 Caused by:
-  ok is false in response body",
+  EOF while parsing a value at line 1 column 0",
         )
         .run();
 }