@@ -37,11 +37,10 @@
  * writing binary), it checks that the handle is indeed a console.
  */
 
 #include "config.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <io.h>
 
 #import "OFWin32ConsoleStdIOStream.h"
 #import "OFColor.h"
@@ -293,11 +292,11 @@
 
 		UTF8Len = OFUTF8StringDecode(
 		    _incompleteUTF8Surrogate, _incompleteUTF8SurrogateLen, &c);
 
 		if (UTF8Len <= 0 || c > 0x10FFFF) {
-			assert(UTF8Len == 0 || UTF8Len < -4);
+			OFAssert(UTF8Len == 0 || UTF8Len < -4);
 
 			UTF16[0] = 0xFFFD;
 			UTF16Len = 1;
 		} else {
 			if (c > 0xFFFF) {