diff --git a/crates/copilot/src/copilot.rs b/crates/copilot/src/copilot.rs
index 3506672b2e79419a3a46cb0963af353a3a71730a..4a08cf2803aaa51a86d5dc7017c559bee1184c2e 100644
--- a/crates/copilot/src/copilot.rs
+++ b/crates/copilot/src/copilot.rs
@@ -1779,6 +1779,7 @@ 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 f92ae2419edf61aaa20643c3f87dac2f4af8bf4e..6724b5b1c2e6b666b7f0295685e40427279a0b30 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,
         }
@@ -2377,7 +2387,7 @@ 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 b9d1105ad02415699fa6a9bd1be8ec1f9c71271a..d2f05a119a1883a1ec744b40d4cdb467074d3c83 100644
--- a/crates/project/src/buffer_store.rs
+++ b/crates/project/src/buffer_store.rs
@@ -527,7 +527,10 @@ 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 654fb0344db4b7dc581234a5b446e8ac4d2b10ab..0ba9787d2e4144cb529756b15fc05ff72dab83c8 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 9e62beb3c375fb8d580be02382091cafe04d31e2..44ba4e752cff778b7918b9a29935d0f0e1ebb614 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,
@@ -3289,7 +3292,10 @@ 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
             },
@@ -3318,7 +3324,7 @@ 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
         };