diff --git a/hw/sh_serial.c b/hw/sh_serial.c
index 43b0eb1c1d782813df63a5f180d2cfe875f99903..1d1883dd2067cd808f3333a4c8d0ece1d0a2ac51 100644
--- a/hw/sh_serial.c
+++ b/hw/sh_serial.c
@@ -186,7 +186,8 @@ static void sh_serial_write(void *opaque, target_phys_addr_t offs,
         }
     }
 
-    fprintf(stderr, "sh_serial: unsupported write to 0x%02x\n", offs);
+    fprintf(stderr, "sh_serial: unsupported write to 0x%02"
+            TARGET_PRIxPHYS "\n", offs);
     abort();
 }
 
@@ -287,7 +288,8 @@ static uint64_t sh_serial_read(void *opaque, target_phys_addr_t offs,
 #endif
 
     if (ret & ~((1 << 16) - 1)) {
-        fprintf(stderr, "sh_serial: unsupported read from 0x%02x\n", offs);
+        fprintf(stderr, "sh_serial: unsupported read from 0x%02"
+                TARGET_PRIxPHYS "\n", offs);
         abort();
     }