diff --git a/proto/backend.proto b/proto/backend.proto
index 51f2089b3..01346b02d 100644
--- a/proto/backend.proto
+++ b/proto/backend.proto
@@ -996,7 +996,7 @@ message GraphsOut {
     uint32 next_day_at_secs = 4;
     uint32 scheduler_version = 5;
     /// Seconds to add to UTC timestamps to get local time.
-    uint32 local_offset_secs = 7;
+    int32 local_offset_secs = 7;
 }
 
 message RevlogEntry {
diff --git a/rslib/src/stats/graphs.rs b/rslib/src/stats/graphs.rs
index 48c897d34..601de79fe 100644
--- a/rslib/src/stats/graphs.rs
+++ b/rslib/src/stats/graphs.rs
@@ -41,7 +41,7 @@ impl Collection {
             days_elapsed: timing.days_elapsed,
             next_day_at_secs: timing.next_day_at as u32,
             scheduler_version: self.sched_ver() as u32,
-            local_offset_secs: local_offset_secs as u32,
+            local_offset_secs: local_offset_secs as i32,
         })
     }
 }