diff --git a/src/common/small_string.cpp b/src/common/small_string.cpp
index 80feac71b..1284b7e29 100644
--- a/src/common/small_string.cpp
+++ b/src/common/small_string.cpp
@@ -460,7 +460,7 @@ void SmallStringBase::assign(SmallStringBase&& move)
   }
   else
   {
-    assign(move.m_buffer, move.m_buffer_size);
+    assign(move.m_buffer, move.m_length);
   }
 }