diff --git a/radio/src/targets/taranis/CMakeLists.txt b/radio/src/targets/taranis/CMakeLists.txt
index 8ddf80739..e75d5a630 100644
--- a/radio/src/targets/taranis/CMakeLists.txt
+++ b/radio/src/targets/taranis/CMakeLists.txt
@@ -490,7 +490,7 @@ endif()
 
 if(INTERNAL_MODULE_SERIAL)
 
-  if("${PCBREV}" STREQUAL 2019 OR "${PCBREV}" STREQUAL ACCESS)
+  if(DEFAULT_INTERNAL_MODULE STREQUAL ISRM_PXX2)
     # defines existing internal modules
     set(INTERNAL_MODULES PXX2 CACHE STRING "Internal modules")
   else()