diff --git a/rust/arrow/src/buffer.rs b/rust/arrow/src/buffer.rs
index c2a11bea4c2e0..b56dba29a06af 100644
--- a/rust/arrow/src/buffer.rs
+++ b/rust/arrow/src/buffer.rs
@@ -70,7 +70,7 @@ struct BufferData {
 
 impl PartialEq for BufferData {
     fn eq(&self, other: &BufferData) -> bool {
-        if self.capacity != other.capacity {
+        if self.len != other.len {
             return false;
         }