diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b1c74946..69bf25f5f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -198,6 +198,7 @@ endif()
 
 CHECK_INCLUDE_FILE(dlfcn.h HAVE_DLFCN_H)
 CHECK_INCLUDE_FILE(fcntl.h HAVE_FCNTL_H)
+CHECK_INCLUDE_FILE(in6addr.h HAVE_IN6ADDR_H)
 CHECK_INCLUDE_FILE(inttypes.h HAVE_INTTYPES_H)
 CHECK_INCLUDE_FILE(memory.h HAVE_MEMORY_H)
 CHECK_INCLUDE_FILE(netinet/in.h HAVE_NETINET_IN_H)
diff --git a/config.h.cmake b/config.h.cmake
index bc16e2383..2b883961b 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -68,6 +68,9 @@
 /* Define to 1 if you have the `getenv’ function. */
 #cmakedefine HAVE_GETENV
 
+/* Define to 1 if you have the <in6addr.h> header file. */
+#cmakedefine HAVE_IN6ADDR_H
+
 /* Define to 1 if you have the <inttypes.h> header file. */
 #cmakedefine HAVE_INTTYPES_H
 
diff --git a/lib/private-libwebsockets.h b/lib/private-libwebsockets.h
index 26c3030f4..80299acea 100644
--- a/lib/private-libwebsockets.h
+++ b/lib/private-libwebsockets.h
@@ -83,7 +83,7 @@
 #include <winsock2.h>
 #include <windows.h>
 #include <tchar.h>
-#ifdef LWS_USE_IPV6
+#ifdef HAVE_IN6ADDR_H
 #include <in6addr.h>
 #endif
 #include <mstcpip.h>