diff --git a/tests/regress/mips_branch_likely_issue.c b/tests/regress/mips_branch_likely_issue.c
index 84f49cdc..3e94851b 100644
--- a/tests/regress/mips_branch_likely_issue.c
+++ b/tests/regress/mips_branch_likely_issue.c
@@ -61,7 +61,7 @@ bool test2_delayslot_hooked = false;
 // This hook is used to show that code is executing in the emulator.
 static void mips_codehook(uc_engine *uc, uint64_t address, uint32_t size, void *user_data)
 {
-    printf("Test %d Executing: %llX\n", test_num, address);
+    printf("Test %d Executing: %"PRIx64"\n", test_num, address);
     if( test_num == 1 && address == 0x100010 )
     {
         printf("Delay slot hook called!\n");
diff --git a/tests/regress/mips_delay_slot_code_hook.c b/tests/regress/mips_delay_slot_code_hook.c
index 905cad8d..e1fbc734 100644
--- a/tests/regress/mips_delay_slot_code_hook.c
+++ b/tests/regress/mips_delay_slot_code_hook.c
@@ -59,7 +59,7 @@ static void mips_codehook(uc_engine *uc, uint64_t address, uint32_t size, void *
 		printf("\nloop %d:\n", loop_count);
 		loop_count++;
 	}
-	printf("Code: %llX\n", address);
+	printf("Code: %"PRIx64"\n", address);
 }
 
 
diff --git a/tests/regress/threaded_emu_start.c b/tests/regress/threaded_emu_start.c
index 9a5a2fa9..8c6dfe5f 100644
--- a/tests/regress/threaded_emu_start.c
+++ b/tests/regress/threaded_emu_start.c
@@ -65,7 +65,7 @@ int loop_count = 0;
 // This hook is used to show that code is executing in the emulator.
 static void mips_codehook(uc_engine *uc, uint64_t address, uint32_t size, void *user_data)
 {
-	printf("Code: %llX\n", address);
+	printf("Code: %"PRIx64"\n", address);
 }