diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index df11f50..3782bdf 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -25,19 +25,15 @@ IF(UNIX AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     TARGET_COMPILE_OPTIONS(libnetwrk INTERFACE "-fconcepts")
     TARGET_COMPILE_OPTIONS(libnetwrk INTERFACE "-fcoroutines")
 
-    CHECK_INCLUDE_FILE_CXX("coroutine"              LIBNETWRK_HAS_COROUTINE     "-fcoroutines")
-    CHECK_INCLUDE_FILE_CXX("experimental/coroutine" LIBNETWRK_HAS_COROUTINE_EXP "-fcoroutines")
+    CHECK_INCLUDE_FILE_CXX("coroutine" LIBNETWRK_HAS_COROUTINE "-fcoroutines")
 ELSEIF(WIN32)
-    CHECK_INCLUDE_FILE_CXX("coroutine"              LIBNETWRK_HAS_COROUTINE)
-    CHECK_INCLUDE_FILE_CXX("experimental/coroutine" LIBNETWRK_HAS_COROUTINE_EXP)
+    CHECK_INCLUDE_FILE_CXX("coroutine" LIBNETWRK_HAS_COROUTINE)
 ENDIF()
 
-IF(NOT LIBNETWRK_HAS_COROUTINE AND NOT LIBNETWRK_HAS_COROUTINE_EXP)
+IF(LIBNETWRK_HAS_COROUTINE)
+    TARGET_COMPILE_DEFINITIONS(libnetwrk INTERFACE -DASIO_HAS_STD_COROUTINE)
+ELSE()
     MESSAGE(FATAL_ERROR "Failed to find coroutine headers.'")
 ENDIF()
 
 TARGET_COMPILE_DEFINITIONS(libnetwrk INTERFACE -DASIO_HAS_CO_AWAIT)
-
-IF(LIBNETWRK_HAS_COROUTINE)
-    TARGET_COMPILE_DEFINITIONS(libnetwrk INTERFACE -DASIO_HAS_STD_COROUTINE)
-ENDIF()