diff --git a/modules/libcom/src/osi/os/default/gnuReadline.c b/modules/libcom/src/osi/os/default/gnuReadline.c
index 765b3420e..a4a322569 100644
--- a/modules/libcom/src/osi/os/default/gnuReadline.c
+++ b/modules/libcom/src/osi/os/default/gnuReadline.c
@@ -95,7 +95,7 @@ osdReadline (const char *prompt, struct readlineContext *context)
             if ((linelen + 1) >= linesize) {
                 char *cp;
 
-                linesize += 50;
+                linesize = linelen + 50;
                 cp = (char *)realloc(line, linesize);
                 if (cp == NULL) {
                     printf ("Out of memory!\n");