diff --git a/CMakeLists.txt b/CMakeLists.txt
index b78c9ac57..5d21bab48 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -569,6 +569,7 @@ CHECK_INCLUDE_FILE(sys/capability.h LWS_HAVE_SYS_CAPABILITY_H)
 CHECK_INCLUDE_FILE(malloc.h LWS_HAVE_MALLOC_H)
 CHECK_INCLUDE_FILE(pthread.h LWS_HAVE_PTHREAD_H)
 CHECK_INCLUDE_FILE(inttypes.h LWS_HAVE_INTTYPES_H)
+CHECK_INCLUDE_FILE(sys/resource.h LWS_HAVE_SYS_RESOURCE_H)
 
 if (WIN32 OR MSVC)
 	CHECK_C_SOURCE_COMPILES("#include <winsock2.h>
diff --git a/cmake/lws_config_private.h.in b/cmake/lws_config_private.h.in
index 51c72fcde..7f61e4fcd 100644
--- a/cmake/lws_config_private.h.in
+++ b/cmake/lws_config_private.h.in
@@ -48,6 +48,9 @@
 /* Define to 1 if you have the <sys/prctl.h> header file. */
 #cmakedefine LWS_HAVE_SYS_PRCTL_H
 
+/* Define to 1 if you have the <sys/resource.h> header file. */
+#cmakedefine LWS_HAVE_SYS_RESOURCE_H
+
 /* Define to 1 if you have the <sys/socket.h> header file. */
 #cmakedefine LWS_HAVE_SYS_SOCKET_H
 
diff --git a/lib/core/context.c b/lib/core/context.c
index 0cdfc7228..8c26d2460 100644
--- a/lib/core/context.c
+++ b/lib/core/context.c
@@ -30,7 +30,7 @@
 
 static const char *library_version = LWS_LIBRARY_VERSION;
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__illumos__)
+#if defined(LWS_HAVE_SYS_RESOURCE_H)
 /* for setrlimit */
 #include <sys/resource.h>
 #endif