diff --git a/modules/rtp_rtcp/source/rtp_dependency_descriptor_writer.cc b/modules/rtp_rtcp/source/rtp_dependency_descriptor_writer.cc
index 9e1a425666..d933a94128 100644
--- a/modules/rtp_rtcp/source/rtp_dependency_descriptor_writer.cc
+++ b/modules/rtp_rtcp/source/rtp_dependency_descriptor_writer.cc
@@ -74,6 +74,11 @@ bool RtpDependencyDescriptorWriter::Write() {
     WriteExtendedFields();
     WriteFrameDependencyDefinition();
   }
+  size_t remaining_bits = bit_writer_.RemainingBitCount();
+  if (remaining_bits > 0) {
+    // Zero remaining memory to avoid leaving it uninitialized.
+    WriteBits(/*val=*/0, remaining_bits);
+  }
   return !build_failed_;
 }