diff --git a/src/buffer.c b/src/buffer.c
index e86246f94..68cc39388 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -386,4 +386,6 @@ void git_buf_rtrim(git_buf *buf)
 
 		buf->size--;
 	}
+
+	buf->ptr[buf->size] = '\0';
 }