diff --git a/upload.html b/upload.html
index 5d54085..31ba498 100644
--- a/upload.html
+++ b/upload.html
@@ -83,7 +83,7 @@ function fileinputChange () {
 		fileinfo.textContent = ''
 		return
 	}
-	fileinfo.textContent = parseInt(fileinput.files[0].size / 1024, 10) + 'kB'
+	fileinfo.textContent = parseInt(fileinput.files[0].size / 1024, 10) + ' kB'
 }
 fileinput.addEventListener('change', fileinputChange, false)
 fileinputChange()