diff --git a/src/hei_chip.hpp b/src/hei_chip.hpp
index 394f51c..38a4ba2 100644
--- a/src/hei_chip.hpp
+++ b/src/hei_chip.hpp
@@ -67,7 +67,7 @@
      * type in order to look up the correct information from the Chip Data
      * Files.
      */
-    ChipType_t iv_type = DEFAULT_CHIP_TYPE;
+    ChipType_t iv_type = CHIP_TYPE_INVALID;
 
 }; // end class Chip