Index: tests/OFList/OFList.m
==================================================================
--- tests/OFList/OFList.m
+++ tests/OFList/OFList.m
@@ -7,13 +7,13 @@
  * This file is part of libobjfw. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
 
-#import <wchar.h>
-#import <stdio.h>
+#define _ISOC99_SOURCE
 #import <string.h>
+#import <wchar.h>
 
 #import "OFString.h"
 #import "OFList.h"
 
 /* TODO: Do real checks */
@@ -37,29 +37,29 @@
 	[list addNew: [OFString newFromWideCString: strings[1]]];
 	[list addNew: [OFString newFromWideCString: strings[2]]];
  
 	for (iter = [list first], i = 0; iter != nil; iter = [iter next], i++)
 		if (!wcscmp([(OFString*)[iter data] wideCString], strings[i]))
-			printf("Element %zu is expected element. GOOD!\n", i);
+			wprintf(L"Element %zu is expected element. GOOD!\n", i);
 		else {
-			printf("Element %zu is not expected element!\n", i);
+			wprintf(L"Element %zu is not expected element!\n", i);
 			return 1;
 		}
 
 	if (!wcscmp([(OFString*)[[list first] data] wideCString], strings[0]))
-		puts("First element is expected element. GOOD!");
+		wprintf(L"First element is expected element. GOOD!\n");
 	else {
-		puts("First element is not expected element!");
+		wprintf(L"First element is not expected element!\n");
 		return 1;
 	}
 
 	if (!wcscmp([(OFString*)[[list last] data] wideCString], strings[2]))
-		puts("Last element is expected element. GOOD!");
+		wprintf(L"Last element is expected element. GOOD!\n");
 	else {
-		puts("Last element is not expected element!");
+		wprintf(L"Last element is not expected element!\n");
 		return 1;
 	}
  
 	[list freeIncludingData];
 
 	return 0;
 }

Index: tests/OFXMLFactory/OFXMLFactory.m
==================================================================
--- tests/OFXMLFactory/OFXMLFactory.m
+++ tests/OFXMLFactory/OFXMLFactory.m
@@ -7,24 +7,26 @@
  * This file is part of libobjfw. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
 
-#import <stdio.h>
+#define _ISOC99_SOURCE
 #import <stdlib.h>
 #import <string.h>
 #import <wchar.h>
 
 #import "OFXMLFactory.h"
 
 inline void
 check_result(char *result, const char *should)
 {
+	/* Use wprintf here so we don't mix printf and wprintf! */
+
 	if (!strcmp(result, should))
-		printf("%s is expected result\n", result);
+		wprintf(L"%s is expected result\n", result);
 	else {
-		printf("%s is NOT expected result!\n", result);
+		wprintf(L"%s is NOT expected result!\n", result);
 		exit(1);
 	}
 
 	free(result);
 }
@@ -222,13 +224,13 @@
 {
 	test_escape();
        	test_create_stanza();
        	test_concat();
 
-	puts("== Now testing with wide C strings ==");
+	wprintf(L"== Now testing with wide C strings ==\n");
 
 	test_escape_wide();
 	test_create_stanza_wide();
 	test_concat_wide();
 
 	return 0;
 }