diff --git a/src/libCom/osi/os/vxWorks/osdStdio.c b/src/libCom/osi/os/vxWorks/osdStdio.c
index 8f3a4c168..219cdc5e2 100644
--- a/src/libCom/osi/os/vxWorks/osdStdio.c
+++ b/src/libCom/osi/os/vxWorks/osdStdio.c
@@ -24,13 +24,14 @@ static STATUS outRoutine(char *buffer, int nchars, int outarg) {
     int free = poutStr->free;
     int len;
     
-    if(free<=1) { /*let fioFormatV continue to count length*/
+    if (free < 1) { /*let fioFormatV continue to count length*/
         return OK;
+    } else if (free > 1) {
+        len = min(free-1, nchars);
+        strncpy(poutStr->str, buffer, len);
+        poutStr->str += len;
+        poutStr->free -= len;
     }
-    len = min(free-1, nchars);
-    strncpy(poutStr->str, buffer, len);
-    poutStr->str += len;
-    poutStr->free -= len;
     /*make sure final string is null terminated*/
     *poutStr->str = 0;
     return OK;