diff --git a/src/streams.cpp b/src/streams.cpp
index baa5ad7abed..cd496ee2be4 100644
--- a/src/streams.cpp
+++ b/src/streams.cpp
@@ -2,6 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or https://opensource.org/license/mit/.
 
+#include <memusage.h>
 #include <span.h>
 #include <streams.h>
 #include <util/fs_helpers.h>
@@ -110,3 +111,8 @@ bool AutoFile::Truncate(unsigned size)
 {
     return ::TruncateFile(m_file, size);
 }
+
+size_t DataStream::GetMemoryUsage() const noexcept
+{
+    return sizeof(*this) + memusage::DynamicUsage(vch);
+}
diff --git a/src/streams.h b/src/streams.h
index e9f3562c6ce..64dbfbff145 100644
--- a/src/streams.h
+++ b/src/streams.h
@@ -277,6 +277,9 @@ public:
     {
         util::Xor(MakeWritableByteSpan(*this), MakeByteSpan(key));
     }
+
+    /** Compute total memory usage of this object (own memory + any dynamic memory). */
+    size_t GetMemoryUsage() const noexcept;
 };
 
 template <typename IStream>