diff --git a/osbase/logtree/leveled.go b/osbase/logtree/leveled.go
index 701d8d0..0ca6e48 100644
--- a/osbase/logtree/leveled.go
+++ b/osbase/logtree/leveled.go
@@ -25,13 +25,13 @@
 
 func SeverityFromProto(s lpb.LeveledLogSeverity) (logging.Severity, error) {
 	switch s {
-	case lpb.LeveledLogSeverity_INFO:
+	case lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_INFO:
 		return logging.INFO, nil
-	case lpb.LeveledLogSeverity_WARNING:
+	case lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_WARNING:
 		return logging.WARNING, nil
-	case lpb.LeveledLogSeverity_ERROR:
+	case lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_ERROR:
 		return logging.ERROR, nil
-	case lpb.LeveledLogSeverity_FATAL:
+	case lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_FATAL:
 		return logging.FATAL, nil
 	default:
 		return "", fmt.Errorf("unknown severity value %d", s)
@@ -41,14 +41,14 @@
 func SeverityToProto(s logging.Severity) lpb.LeveledLogSeverity {
 	switch s {
 	case logging.INFO:
-		return lpb.LeveledLogSeverity_INFO
+		return lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_INFO
 	case logging.WARNING:
-		return lpb.LeveledLogSeverity_WARNING
+		return lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_WARNING
 	case logging.ERROR:
-		return lpb.LeveledLogSeverity_ERROR
+		return lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_ERROR
 	case logging.FATAL:
-		return lpb.LeveledLogSeverity_FATAL
+		return lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_FATAL
 	default:
-		return lpb.LeveledLogSeverity_INVALID
+		return lpb.LeveledLogSeverity_LEVELED_LOG_SEVERITY_INVALID
 	}
 }
diff --git a/osbase/logtree/proto/BUILD.bazel b/osbase/logtree/proto/BUILD.bazel
index b7b76d4..9a87f5c 100644
--- a/osbase/logtree/proto/BUILD.bazel
+++ b/osbase/logtree/proto/BUILD.bazel
@@ -7,7 +7,6 @@
     name = "proto_proto_lint_test",
     except_rules = [
         "PACKAGE_VERSION_SUFFIX",
-        "ENUM_VALUE_PREFIX",  # TODO: evaluate correctness
         "ENUM_ZERO_VALUE_SUFFIX",  # TODO: evaluate correctness
     ],
     protos = [":proto_proto"],
diff --git a/osbase/logtree/proto/logtree.proto b/osbase/logtree/proto/logtree.proto
index fb80a71..ce905cc 100644
--- a/osbase/logtree/proto/logtree.proto
+++ b/osbase/logtree/proto/logtree.proto
@@ -22,11 +22,11 @@
 
 // Severity level corresponding to //osbase/logtree.Severity.
 enum LeveledLogSeverity {
-  INVALID = 0;
-  INFO = 1;
-  WARNING = 2;
-  ERROR = 3;
-  FATAL = 4;
+  LEVELED_LOG_SEVERITY_INVALID = 0;
+  LEVELED_LOG_SEVERITY_INFO = 1;
+  LEVELED_LOG_SEVERITY_WARNING = 2;
+  LEVELED_LOG_SEVERITY_ERROR = 3;
+  LEVELED_LOG_SEVERITY_FATAL = 4;
 }
 
 // LogEntry corresponding to logtree.LogEntry in //osbase/logtree.