diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0ca7dbc..06f8aaa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -131,7 +131,10 @@ if (WPCP_GENERATE_COVERAGE)
 endif ()
 
 
-include_directories(${CHECK_INCLUDE_DIRS} ${LIBWEBSOCKETS_INCLUDE_DIRS} include src)
+include_directories(${LIBWEBSOCKETS_INCLUDE_DIRS} include src)
+if (CHECK_FOUND)
+    include_directories(${CHECK_INCLUDE_DIRS})
+endif()
 
 set(WPCP_PUBLIC_HEADERS
   include/wpcp.h