diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc106c6ee..7245600de 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,9 +59,9 @@ option(TTG_ENABLE_TRACE "Whether to enable ttg::trace() output" OFF)
 option (FORCE_COLORED_OUTPUT "Always produce ANSI-colored output (GNU/Clang only)." TRUE)
 if (FORCE_COLORED_OUTPUT)
     if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-       add_compile_options (-fdiagnostics-color=always)
+       add_compile_options ($<$<COMPILE_LANGUAGE:CXX,C>:-fdiagnostics-color=always>)
     elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-       add_compile_options (-fcolor-diagnostics)
+       add_compile_options ($<$<COMPILE_LANGUAGE:CXX,C>:-fcolor-diagnostics>)
     endif ()
 endif (FORCE_COLORED_OUTPUT)
 
diff --git a/cmake/modules/FindCXXStdCoroutine.cmake b/cmake/modules/FindCXXStdCoroutine.cmake
index 3a86d7a4d..dbe0b394f 100644
--- a/cmake/modules/FindCXXStdCoroutine.cmake
+++ b/cmake/modules/FindCXXStdCoroutine.cmake
@@ -164,7 +164,7 @@ foreach(component IN LISTS CXXStdCoroutines_want_components_ordered)
         add_library(std::coroutine INTERFACE IMPORTED GLOBAL)
         target_compile_features(std::coroutine INTERFACE cxx_std_20)
         if (option)
-          target_compile_options(std::coroutine INTERFACE "${option}")
+          target_compile_options(std::coroutine INTERFACE "$<$<COMPILE_LANGUAGE:CXX>:${option}>")
         endif()
         set(CXX_COROUTINE_COMPONENT "${component}" CACHE STRING "The component of CXXStdCoroutine package found")
         # break out of this loop