diff --git a/CHANGELOG.md b/CHANGELOG.md
index 343670ea6..762a35bcd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@
 * [CHANGE] Lifecycler: Default value of lifecycler's `final-sleep` is now `0s` (i.e. no sleep). #121
 * [CHANGE] Minor cosmetic changes in ring and memberlist HTTP status templates. #149
 * [CHANGE] flagext.Secret: `value` field is no longer exported. Value can be read using `String()` method and set using `Set` method. #154
+* [CHANGE] spanlogger.SpanLogger: Log the user ID from the context with the `user` label instead of `org_id`. #156
 * [ENHANCEMENT] Add middleware package. #38
 * [ENHANCEMENT] Add the ring package #45
 * [ENHANCEMENT] Add limiter package. #41
diff --git a/spanlogger/spanlogger.go b/spanlogger/spanlogger.go
index 91876a728..a4affd841 100644
--- a/spanlogger/spanlogger.go
+++ b/spanlogger/spanlogger.go
@@ -101,7 +101,7 @@ func withContext(ctx context.Context, logger log.Logger, resolver TenantResolver
 	// even though the code-base generally uses `userID` to refer to the same thing.
 	userID, err := resolver.TenantID(ctx)
 	if err == nil && userID != "" {
-		logger = log.With(logger, "org_id", userID)
+		logger = log.With(logger, "user", userID)
 	}
 
 	traceID, ok := tracing.ExtractSampledTraceID(ctx)