diff --git a/src/exchange/taler-exchange-httpd_kyc-proof.h b/src/exchange/taler-exchange-httpd_kyc-proof.h
index 98551557b..d40ea90a9 100644
--- a/src/exchange/taler-exchange-httpd_kyc-proof.h
+++ b/src/exchange/taler-exchange-httpd_kyc-proof.h
@@ -43,7 +43,7 @@ TEH_kyc_proof_cleanup (void);
 MHD_RESULT
 TEH_handler_kyc_proof (
   struct TEH_RequestContext *rc,
-  const char *const args[3]);
+  const char *const args[1]);
 
 
 #endif