diff --git a/src/gfile/gfile_printg.c b/src/gfile/gfile_printg.c
index 94a16142..577e6246 100644
--- a/src/gfile/gfile_printg.c
+++ b/src/gfile/gfile_printg.c
@@ -137,7 +137,7 @@ int vfnprintg(GFILE *f, int maxlen, const char *fmt, va_list arg) {
 		case 's':
 			filler = ' ';
 			if ((s = va_arg(arg, char *)) == 0)
-				s = "(null)";
+				s = (char*)"(null)";
 			if (precision == 0)
 				precision = 32767;
 			for (p = s; *p && (--precision >= 0); p++);