diff --git a/renderdoc/driver/shaders/dxil/dxil_reflect.cpp b/renderdoc/driver/shaders/dxil/dxil_reflect.cpp
index d63878e25..738401122 100644
--- a/renderdoc/driver/shaders/dxil/dxil_reflect.cpp
+++ b/renderdoc/driver/shaders/dxil/dxil_reflect.cpp
@@ -580,6 +580,8 @@ static DXBC::CBufferVariableType MakeCBufferVariableType(const TypeInfo &typeInf
       var.type = MakeCBufferVariableType(typeInfo, t->members[i]);
     }
 
+    ret.bytesize = var.offset + var.type.bytesize;
+
     ret.members.push_back(var);
   }