diff --git a/Source/DOH/fio.c b/Source/DOH/fio.c
index 6fa682e49..1487efe1b 100644
--- a/Source/DOH/fio.c
+++ b/Source/DOH/fio.c
@@ -105,7 +105,7 @@ DohvPrintf(DOH *so, const char *format, va_list ap)
   int   nbytes = 0;
   char  encoder[128], *ec = 0;
 
-  memset (newformat, 0, sizeof (char *));
+  memset (newformat, 0, sizeof (newformat));
 
   while (*p) {
     switch(state) {