diff --git a/tester/CMakeLists.txt b/tester/CMakeLists.txt
index 099c37c2b..60b1ab5e2 100644
--- a/tester/CMakeLists.txt
+++ b/tester/CMakeLists.txt
@@ -204,7 +204,7 @@ if(APPLE)
 endif()
 
 bc_apply_compile_flags(SOURCE_FILES_C STRICT_OPTIONS_CPP STRICT_OPTIONS_C)
-bc_apply_compile_flags(SOURCE_FILES_C_CXX STRICT_OPTIONS_CPP STRICT_OPTIONS_CXX)
+bc_apply_compile_flags(SOURCE_FILES_CXX STRICT_OPTIONS_CPP STRICT_OPTIONS_CXX)
 bc_apply_compile_flags(SOURCE_FILES_OBJC STRICT_OPTIONS_CPP STRICT_OPTIONS_OBJC)
 
 if(MSVC)