diff --git a/radio/src/targets/taranis/CMakeLists.txt b/radio/src/targets/taranis/CMakeLists.txt
index dc67b83dd..bc54a4e2a 100644
--- a/radio/src/targets/taranis/CMakeLists.txt
+++ b/radio/src/targets/taranis/CMakeLists.txt
@@ -355,7 +355,7 @@ endif()
 
 if(INTERNAL_MODULE_SERIAL)
 
-  if(${PCBREV} STREQUAL 2019 OR ${PCBREV} STREQUAL ACCESS)
+  if("${PCBREV}" STREQUAL 2019 OR "${PCBREV}" STREQUAL ACCESS)
     # defines existing internal modules
     set(INTERNAL_MODULES PXX2)
   else()