diff --git a/src/exchange/taler-exchange-httpd_metrics.c b/src/exchange/taler-exchange-httpd_metrics.c
index df37280ca..c7165326b 100644
--- a/src/exchange/taler-exchange-httpd_metrics.c
+++ b/src/exchange/taler-exchange-httpd_metrics.c
@@ -72,11 +72,11 @@ TEH_handler_metrics (struct TEH_RequestContext *rc,
                    TEH_METRICS_num_conflict[TEH_MT_WITHDRAW],
                    "melt",
                    TEH_METRICS_num_conflict[TEH_MT_MELT],
-                   "reveal-precheck",
+                   "reveal_precheck",
                    TEH_METRICS_num_conflict[TEH_MT_REVEAL_PRECHECK],
                    "reveal",
                    TEH_METRICS_num_conflict[TEH_MT_REVEAL],
-                   "reveal-persist",
+                   "reveal_persist",
                    TEH_METRICS_num_conflict[TEH_MT_REVEAL_PERSIST],
                    "other",
                    TEH_METRICS_num_requests[TEH_MT_OTHER],
@@ -86,11 +86,11 @@ TEH_handler_metrics (struct TEH_RequestContext *rc,
                    TEH_METRICS_num_requests[TEH_MT_WITHDRAW],
                    "melt",
                    TEH_METRICS_num_requests[TEH_MT_MELT],
-                   "reveal-precheck",
+                   "reveal_precheck",
                    TEH_METRICS_num_requests[TEH_MT_REVEAL_PRECHECK],
                    "reveal",
                    TEH_METRICS_num_requests[TEH_MT_REVEAL],
-                   "reveal-persist",
+                   "reveal_persist",
                    TEH_METRICS_num_requests[TEH_MT_REVEAL_PERSIST]);
   resp = MHD_create_response_from_buffer (strlen (reply),
                                           reply,