diff --git a/include/ctraces/ctr_variant_utils.h b/include/ctraces/ctr_variant_utils.h
index d8f2516..029950c 100644
--- a/include/ctraces/ctr_variant_utils.h
+++ b/include/ctraces/ctr_variant_utils.h
@@ -420,6 +420,7 @@ static inline int unpack_cfl_variant_string(mpack_reader_t *reader,
     }
 
     (*value)->type = CFL_VARIANT_STRING;
+    (*value)->size = value_length;
 
     return 0;
 }
@@ -465,6 +466,7 @@ static inline int unpack_cfl_variant_binary(mpack_reader_t *reader,
     }
 
     (*value)->type = CFL_VARIANT_BYTES;
+    (*value)->size = value_length;
 
     return 0;
 }