diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a51d5285c..8374f911a6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ project(boost_cobalt VERSION "${BOOST_COBALT_VERSION}" LANGUAGES CXX)
 
 include(cmake/CheckRequirements.cmake)
 if (NOT BOOST_COBALT_REQUIREMENTS_MATCHED)
-    return()
+    message(FATAL_ERROR "The current compiler is not supported.")
 endif()
 
 set(BOOST_COBALT_IS_ROOT OFF)