diff --git a/hw/net/smc91c111.c b/hw/net/smc91c111.c
index c8cc5379b7812c47a0795c2d276354f35a2344da..9094c0b47ca8aca1cd79e10b7b6ee83dcae56609 100644
--- a/hw/net/smc91c111.c
+++ b/hw/net/smc91c111.c
@@ -11,6 +11,7 @@
 #include "hw/sysbus.h"
 #include "net/net.h"
 #include "hw/devices.h"
+#include "qemu/log.h"
 /* For crc32 */
 #include <zlib.h>
 
@@ -478,7 +479,9 @@ static void smc91c111_writeb(void *opaque, hwaddr offset,
         }
         break;
     }
-    hw_error("smc91c111_write: Bad reg %d:%x\n", s->bank, (int)offset);
+    qemu_log_mask(LOG_GUEST_ERROR, "smc91c111_write(bank:%d) Illegal register"
+                                   " 0x%" HWADDR_PRIx " = 0x%x\n",
+                  s->bank, offset, value);
 }
 
 static uint32_t smc91c111_readb(void *opaque, hwaddr offset)
@@ -621,7 +624,9 @@ static uint32_t smc91c111_readb(void *opaque, hwaddr offset)
         }
         break;
     }
-    hw_error("smc91c111_read: Bad reg %d:%x\n", s->bank, (int)offset);
+    qemu_log_mask(LOG_GUEST_ERROR, "smc91c111_read(bank:%d) Illegal register"
+                                   " 0x%" HWADDR_PRIx "\n",
+                  s->bank, offset);
     return 0;
 }