diff --git a/server/src/models.rs b/server/src/models.rs
index 1bf4ecc..77f1cd0 100644
--- a/server/src/models.rs
+++ b/server/src/models.rs
@@ -349,15 +349,29 @@ impl ModelStore {
             etag = etag_of(&response);
         }
 
-        let length: Option<u64> = response
-            .headers()
-            .get("content-length")
-            .and_then(|v| v.to_str().ok()?.parse().ok());
-        let (mut done, total) = if resumed {
-            (have, length.map(|l| have + l))
+        // On a 206, Content-Length is the length of the *range*, not of
+        // the file -- it answers a different question than the one a
+        // progress bar asks, and taken at face value it would fill the bar
+        // at 72 MB of a 234 MB model. The whole size is the last field of
+        // Content-Range (`bytes 162000000-234074815/234074816`), which has
+        // the further merit of not depending on where the range began.
+        let total: Option<u64> = if resumed {
+            response
+                .headers()
+                .get("content-range")
+                .and_then(|v| v.to_str().ok())
+                .and_then(|v| {
+                    v.rsplit_once('/')
+                        .map(|(_, whole)| whole.trim().to_string())
+                })
+                .and_then(|whole| whole.parse().ok())
         } else {
-            (0, length)
+            response
+                .headers()
+                .get("content-length")
+                .and_then(|v| v.to_str().ok()?.parse().ok())
         };
+        let mut done = if resumed { have } else { 0 };
         {
             let mut p = run.progress.lock().unwrap();
             p.done = done;