diff --git a/httpupload.go b/httpupload.go
index fdc82b3..85a3282 100644
--- a/httpupload.go
+++ b/httpupload.go
@@ -155,8 +155,8 @@ func httpUpload(client *xmpp.Client, iqc chan xmpp.IQ, jserver string, filePath
 	if maxFileSize != 0 {
 		if fileSize > maxFileSize {
 			return "", errors.New("http-upload: file size " + strconv.FormatInt(fileSize/1024/1024, 10) +
-				" MB is larger than the maximum file size allowed (" +
-				strconv.FormatInt(maxFileSize/1024/1024, 10) + " MB).")
+				" MiB is larger than the maximum file size allowed (" +
+				strconv.FormatInt(maxFileSize/1024/1024, 10) + " MiB).")
 		}
 	}