diff --git a/hw/mips/malta.c b/hw/mips/malta.c
index e4c4de1b4e..b673a3a248 100644
--- a/hw/mips/malta.c
+++ b/hw/mips/malta.c
@@ -427,10 +427,9 @@ static uint64_t malta_fpga_read(void *opaque, hwaddr addr,
         break;
 
     default:
-#if 0
-        printf("malta_fpga_read: Bad register offset 0x" TARGET_FMT_lx "\n",
-               addr);
-#endif
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "malta_fpga_read: Bad register addr 0x%"HWADDR_PRIX"\n",
+                      addr);
         break;
     }
     return val;
@@ -515,10 +514,9 @@ static void malta_fpga_write(void *opaque, hwaddr addr,
         break;
 
     default:
-#if 0
-        printf("malta_fpga_write: Bad register offset 0x" TARGET_FMT_lx "\n",
-               addr);
-#endif
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "malta_fpga_write: Bad register addr 0x%"HWADDR_PRIX"\n",
+                      addr);
         break;
     }
 }