diff --git a/include/etl/profiles/determine_compiler.h b/include/etl/profiles/determine_compiler.h
index 5428f35a2..39cb9a43a 100644
--- a/include/etl/profiles/determine_compiler.h
+++ b/include/etl/profiles/determine_compiler.h
@@ -79,7 +79,7 @@ SOFTWARE.
     #if defined(__clang__) || defined(__llvm__)
       #define ETL_COMPILER_CLANG
       #define ETL_COMPILER_TYPE_DETECTED
-      #if __AVR__ == 1
+      #if defined(__AVR__) && (__AVR__ == 1)
         #define ETL_CROSS_COMPILING_TO_AVR
       #endif
     #endif