diff --git a/code/services-application/api-service/src/main/java/nu/marginalia/api/ApiService.java b/code/services-application/api-service/src/main/java/nu/marginalia/api/ApiService.java
index efb59a7a..91ab850b 100644
--- a/code/services-application/api-service/src/main/java/nu/marginalia/api/ApiService.java
+++ b/code/services-application/api-service/src/main/java/nu/marginalia/api/ApiService.java
@@ -49,6 +49,7 @@ public class ApiService extends Service {
 
     private static final Histogram wmsa_api_query_time = Histogram.build()
             .name("wmsa_api_query_time")
+            .labelNames("key")
             .linearBuckets(0.005, 0.005, 15)
             .help("API-side query time")
             .register();