diff --git a/radio/src/CMakeLists.txt b/radio/src/CMakeLists.txt
index ef540a161..f6a09115b 100644
--- a/radio/src/CMakeLists.txt
+++ b/radio/src/CMakeLists.txt
@@ -309,7 +309,7 @@ if(NIGHTLY_BUILD_WARNING)
 endif()
 
 if(MODULE_R9M_FLEX_FW)
-    add_definitions(-DMODULE_R9M_FLEX_FW)
+  add_definitions(-DMODULE_R9M_FLEX_FW)
 endif()
 
 if(FRSKY_RELEASE)