diff --git a/src/msh.c b/src/msh.c
index 3139531..28a07c1 100644
--- a/src/msh.c
+++ b/src/msh.c
@@ -484,7 +484,7 @@ int main(int argc, char** argv) {
         fprintf(historyfile, "%s\n", line);
         fflush(historyfile);
         
-        while (tokenworkcapacity < linelen - 1) {
+        while (tokenworkcapacity + 1 < linelen) {
             tokenworkcapacity *= 2;
             tokenwork = realloc(tokenwork, tokenworkcapacity);
         }