diff --git a/src/shared/varlink-io.systemd.Login.c b/src/shared/varlink-io.systemd.Login.c
index cf09d18286..9a07155ef2 100644
--- a/src/shared/varlink-io.systemd.Login.c
+++ b/src/shared/varlink-io.systemd.Login.c
@@ -94,6 +94,7 @@ static SD_VARLINK_DEFINE_ERROR(AlreadySessionMember);
 static SD_VARLINK_DEFINE_ERROR(VirtualTerminalAlreadyTaken);
 static SD_VARLINK_DEFINE_ERROR(TooManySessions);
 static SD_VARLINK_DEFINE_ERROR(UnitAllocationFailed);
+static SD_VARLINK_DEFINE_ERROR(NoSessionPIDFD);
 
 SD_VARLINK_DEFINE_INTERFACE(
                 io_systemd_Login,
@@ -120,4 +121,6 @@ SD_VARLINK_DEFINE_INTERFACE(
                 SD_VARLINK_SYMBOL_COMMENT("Maximum number of sessions reached"),
                 &vl_error_TooManySessions,
                 SD_VARLINK_SYMBOL_COMMENT("Failed to allocate a unit for the session"),
-                &vl_error_UnitAllocationFailed);
+                &vl_error_UnitAllocationFailed,
+                SD_VARLINK_SYMBOL_COMMENT("The session leader process does not have a pidfd"),
+                &vl_error_NoSessionPIDFD);