diff --git a/gstreamer/src/buffer.rs b/gstreamer/src/buffer.rs
index 9f1e54200..663a6f15c 100644
--- a/gstreamer/src/buffer.rs
+++ b/gstreamer/src/buffer.rs
@@ -374,7 +374,11 @@ impl BufferRef {
     }
 
     pub fn set_flags(&mut self, flags: BufferFlags) {
-        self.0.mini_object.flags = flags.bits();
+        self.0.mini_object.flags |= flags.bits();
+    }
+
+    pub fn unset_flags(&mut self, flags: BufferFlags) {
+        self.0.mini_object.flags &= !flags.bits();
     }
 
     pub fn get_meta<T: MetaAPI>(&self) -> Option<MetaRef<T>> {