diff --git a/crates/copilot/src/copilot.rs b/crates/copilot/src/copilot.rs
index a1bbc26b9c44d0..2314a62524e56c 100644
--- a/crates/copilot/src/copilot.rs
+++ b/crates/copilot/src/copilot.rs
@@ -1780,6 +1780,7 @@ mod tests {
         fn disk_state(&self) -> language::DiskState {
             language::DiskState::Present {
                 mtime: ::fs::MTime::from_seconds_and_nanos(100, 42),
+                size: 0,
             }
         }
 
diff --git a/crates/language/src/buffer.rs b/crates/language/src/buffer.rs
index 2721c1fc552ad8..578c0832a0e862 100644
--- a/crates/language/src/buffer.rs
+++ b/crates/language/src/buffer.rs
@@ -435,7 +435,7 @@ pub enum DiskState {
     /// File created in Zed that has not been saved.
     New,
     /// File present on the filesystem.
-    Present { mtime: MTime },
+    Present { mtime: MTime, size: u64 },
     /// Deleted file that was previously present.
     Deleted,
     /// An old version of a file that was previously present
@@ -448,7 +448,17 @@ impl DiskState {
     pub fn mtime(self) -> Option<MTime> {
         match self {
             DiskState::New => None,
-            DiskState::Present { mtime } => Some(mtime),
+            DiskState::Present { mtime, .. } => Some(mtime),
+            DiskState::Deleted => None,
+            DiskState::Historic { .. } => None,
+        }
+    }
+
+    /// Returns the file's size on disk in bytes.
+    pub fn size(self) -> Option<u64> {
+        match self {
+            DiskState::New => None,
+            DiskState::Present { size, .. } => Some(size),
             DiskState::Deleted => None,
             DiskState::Historic { .. } => None,
         }
@@ -2373,7 +2383,7 @@ impl Buffer {
         };
         match file.disk_state() {
             DiskState::New => false,
-            DiskState::Present { mtime } => match self.saved_mtime {
+            DiskState::Present { mtime, .. } => match self.saved_mtime {
                 Some(saved_mtime) => {
                     mtime.bad_is_greater_than(saved_mtime) && self.has_unsaved_edits()
                 }
diff --git a/crates/project/src/buffer_store.rs b/crates/project/src/buffer_store.rs
index 8b65caca7e2c2e..abeabba4bdbe73 100644
--- a/crates/project/src/buffer_store.rs
+++ b/crates/project/src/buffer_store.rs
@@ -532,7 +532,10 @@ impl LocalBufferStore {
             let new_file = if let Some(entry) = snapshot_entry {
                 File {
                     disk_state: match entry.mtime {
-                        Some(mtime) => DiskState::Present { mtime },
+                        Some(mtime) => DiskState::Present {
+                            mtime,
+                            size: entry.size,
+                        },
                         None => old_file.disk_state,
                     },
                     is_local: true,
diff --git a/crates/project/src/image_store.rs b/crates/project/src/image_store.rs
index 654fb0344db4b7..0ba9787d2e4144 100644
--- a/crates/project/src/image_store.rs
+++ b/crates/project/src/image_store.rs
@@ -808,7 +808,10 @@ impl LocalImageStore {
             let new_file = if let Some(entry) = snapshot_entry {
                 worktree::File {
                     disk_state: match entry.mtime {
-                        Some(mtime) => DiskState::Present { mtime },
+                        Some(mtime) => DiskState::Present {
+                            mtime,
+                            size: entry.size,
+                        },
                         None => old_file.disk_state,
                     },
                     is_local: true,
diff --git a/crates/worktree/src/worktree.rs b/crates/worktree/src/worktree.rs
index 69b0be24e7ffb0..09e7d44424a09a 100644
--- a/crates/worktree/src/worktree.rs
+++ b/crates/worktree/src/worktree.rs
@@ -1322,6 +1322,7 @@ impl LocalWorktree {
                         path,
                         disk_state: DiskState::Present {
                             mtime: metadata.mtime,
+                            size: metadata.len,
                         },
                         is_local: true,
                         is_private,
@@ -1378,6 +1379,7 @@ impl LocalWorktree {
                         path,
                         disk_state: DiskState::Present {
                             mtime: metadata.mtime,
+                            size: metadata.len,
                         },
                         is_local: true,
                         is_private,
@@ -1575,6 +1577,7 @@ impl LocalWorktree {
                     path,
                     disk_state: DiskState::Present {
                         mtime: metadata.mtime,
+                        size: metadata.len,
                     },
                     entry_id: None,
                     is_local: true,
@@ -3280,7 +3283,10 @@ impl File {
             worktree,
             path: entry.path.clone(),
             disk_state: if let Some(mtime) = entry.mtime {
-                DiskState::Present { mtime }
+                DiskState::Present {
+                    mtime,
+                    size: entry.size,
+                }
             } else {
                 DiskState::New
             },
@@ -3309,7 +3315,7 @@ impl File {
         } else if proto.is_deleted {
             DiskState::Deleted
         } else if let Some(mtime) = proto.mtime.map(&Into::into) {
-            DiskState::Present { mtime }
+            DiskState::Present { mtime, size: 0 }
         } else {
             DiskState::New
         };