diff --git a/src/ui.c b/src/ui.c
index f1ad65e83..99cf1ecee 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -64,7 +64,7 @@ file_finder_read(struct file_finder *finder, const char *commit)
 			break;
 		}
 
-		finder->file[files] = calloc(1, sizeof(*finder->file) + buf.size);
+		finder->file[files] = calloc(1, sizeof(*finder->file) + buf.size + 1);
 		if (!finder->file[files]) {
 			ok = false;
 			break;