diff --git a/tests/regress/invalid_read_in_cpu_tb_exec.c b/tests/regress/invalid_read_in_cpu_tb_exec.c
index 7654c07e..755b7180 100644
--- a/tests/regress/invalid_read_in_cpu_tb_exec.c
+++ b/tests/regress/invalid_read_in_cpu_tb_exec.c
@@ -1,7 +1,8 @@
+#include <inttypes.h>
 #include <unicorn/unicorn.h>
 
 static void hook_block(uc_engine *uc, uint64_t address, uint32_t size, void *user_data) {
-  printf("hook_block(%p, %lx, %d, %p)\n", uc, address, size, user_data);
+  printf("hook_block(%p, %"PRIx64", %d, %p)\n", uc, address, size, user_data);
 }
 
 /*