diff --git a/src/qvi-bbuff.cc b/src/qvi-bbuff.cc
index b0d7853..b50bf65 100644
--- a/src/qvi-bbuff.cc
+++ b/src/qvi-bbuff.cc
@@ -37,6 +37,14 @@ qvi_bbuff::~qvi_bbuff(void)
     if (m_data) free(m_data);
 }
 
+void
+qvi_bbuff::operator=(
+    const qvi_bbuff &src
+) {
+    const int rc = append(src.m_data, src.m_size);
+    if (qvi_unlikely(rc != QV_SUCCESS)) throw qvi_runtime_error();
+}
+
 size_t
 qvi_bbuff::size(void) const
 {
diff --git a/src/qvi-bbuff.h b/src/qvi-bbuff.h
index 49e2ab2..6f3b3e1 100644
--- a/src/qvi-bbuff.h
+++ b/src/qvi-bbuff.h
@@ -42,7 +42,7 @@ struct qvi_bbuff {
     ~qvi_bbuff(void);
     /** Assignment operator. */
     void
-    operator=(const qvi_bbuff &src) = delete;
+    operator=(const qvi_bbuff &src);
     /** Returns the size of the data stored in the byte buffer. */
     size_t
     size(void) const;