diff --git a/src/core/impl/dtype.cpp b/src/core/impl/dtype.cpp
index 5f2d44f2..494dbcd0 100644
--- a/src/core/impl/dtype.cpp
+++ b/src/core/impl/dtype.cpp
@@ -209,6 +209,7 @@ typename ctype_enable_if<ctype>::type DTypeScalar::set_retain_dtype(ctype val) {
     }
         MEGDNN_FOREACH_COMPUTING_DTYPE(cb)
         MEGDNN_FOREACH_QUANTIZED_DTYPE(cb)
+        cb(dt_bool);
 #undef cb
         default:
             mgb_throw(ConversionError, "can not assign to dtype %s", m_dtype.name());