diff --git a/lib/tput.js b/lib/tput.js
index c6b6ccd..c00d1e3 100644
--- a/lib/tput.js
+++ b/lib/tput.js
@@ -1137,7 +1137,7 @@ function sprintf(src) {
 
     if (opt.space) {
       if (!opt.signs && +initial >= 0) {
-        param = ' ' + param;
+        pre += ' ';
       }
     }