diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 8f50b8afea..36edfcf467 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -44,8 +44,8 @@ void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
                                    &error_abort);
     if ((slot < 0 || slot >= machine->ram_slots) &&
          slot != PC_DIMM_UNASSIGNED_SLOT) {
-        error_setg(&local_err, "invalid slot number, valid range is [0-%"
-                   PRIu64 "]", machine->ram_slots - 1);
+        error_setg(&local_err, "invalid slot number %d, valid range is [0-%"
+                   PRIu64 "]", slot, machine->ram_slots - 1);
         goto out;
     }