diff --git a/hw/core/register.c b/hw/core/register.c
index 3600ef5bde..d6f8c20816 100644
--- a/hw/core/register.c
+++ b/hw/core/register.c
@@ -80,7 +80,7 @@ void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
 
     if (!ac || !ac->name) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: write to undefined device state "
-                      "(written value: %#" PRIx64 ")\n", prefix, val);
+                      "(written value: 0x%" PRIx64 ")\n", prefix, val);
         return;
     }
 
@@ -89,14 +89,14 @@ void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
     test = (old_val ^ val) & ac->rsvd;
     if (test) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: change of value in reserved bit"
-                      "fields: %#" PRIx64 ")\n", prefix, test);
+                      "fields: 0x%" PRIx64 ")\n", prefix, test);
     }
 
     test = val & ac->unimp;
     if (test) {
         qemu_log_mask(LOG_UNIMP,
-                      "%s:%s writing %#" PRIx64 " to unimplemented bits:" \
-                      " %#" PRIx64 "\n",
+                      "%s:%s writing 0x%" PRIx64 " to unimplemented bits:" \
+                      " 0x%" PRIx64 "\n",
                       prefix, reg->access->name, val, ac->unimp);
     }
 
@@ -112,7 +112,7 @@ void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
     }
 
     if (debug) {
-        qemu_log("%s:%s: write of value %#" PRIx64 "\n", prefix, ac->name,
+        qemu_log("%s:%s: write of value 0x%" PRIx64 "\n", prefix, ac->name,
                  new_val);
     }
 
@@ -150,7 +150,7 @@ uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
     }
 
     if (debug) {
-        qemu_log("%s:%s: read of value %#" PRIx64 "\n", prefix,
+        qemu_log("%s:%s: read of value 0x%" PRIx64 "\n", prefix,
                  ac->name, ret);
     }
 
@@ -193,7 +193,7 @@ void register_write_memory(void *opaque, hwaddr addr,
 
     if (!reg) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: write to unimplemented register " \
-                      "at address: %#" PRIx64 "\n", reg_array->prefix, addr);
+                      "at address: 0x%" PRIx64 "\n", reg_array->prefix, addr);
         return;
     }
 
@@ -222,7 +222,7 @@ uint64_t register_read_memory(void *opaque, hwaddr addr,
 
     if (!reg) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s:  read to unimplemented register " \
-                      "at address: %#" PRIx64 "\n", reg_array->prefix, addr);
+                      "at address: 0x%" PRIx64 "\n", reg_array->prefix, addr);
         return 0;
     }