diff --git a/pkg/protocol/decoder/opentelemetry/otlp_trace_parser.go b/pkg/protocol/decoder/opentelemetry/otlp_trace_parser.go
index 18dd0de8b9..f2363c2c55 100644
--- a/pkg/protocol/decoder/opentelemetry/otlp_trace_parser.go
+++ b/pkg/protocol/decoder/opentelemetry/otlp_trace_parser.go
@@ -503,7 +503,7 @@ func v1EventsToString(events []*v1.Span_Event) string {
 func keyValueToString(keyValues []*v1Common.KeyValue) string {
 	var results = make(map[string]string)
 	for _, keyValue := range keyValues {
-		results[keyValue.Key] = keyValue.Value.GetStringValue()
+		results[keyValue.Key] = anyValueToString(keyValue.Value)
 	}
 
 	var d []byte