diff --git a/src/aarch64/Ginit.c b/src/aarch64/Ginit.c
index 449b4170..3c821b2d 100644
--- a/src/aarch64/Ginit.c
+++ b/src/aarch64/Ginit.c
@@ -86,13 +86,13 @@ access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
 {
   if (write)
     {
-      Debug (16, "mem[%x] <- %x\n", addr, *val);
+      Debug (16, "mem[%lx] <- %lx\n", addr, *val);
       *(unw_word_t *) addr = *val;
     }
   else
     {
       *val = *(unw_word_t *) addr;
-      Debug (16, "mem[%x] -> %x\n", addr, *val);
+      Debug (16, "mem[%lx] -> %lx\n", addr, *val);
     }
   return 0;
 }
@@ -113,12 +113,12 @@ access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
   if (write)
     {
       *(unw_word_t *) addr = *val;
-      Debug (12, "%s <- %x\n", unw_regname (reg), *val);
+      Debug (12, "%s <- %lx\n", unw_regname (reg), *val);
     }
   else
     {
       *val = *(unw_word_t *) addr;
-      Debug (12, "%s -> %x\n", unw_regname (reg), *val);
+      Debug (12, "%s -> %lx\n", unw_regname (reg), *val);
     }
   return 0;