diff --git a/CMakeLists.txt b/CMakeLists.txt
index d8c0b195..5c619341 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -338,6 +338,9 @@ CHECK_FUNCTION_EXISTS(socket LWS_HAVE_SOCKET)
 CHECK_FUNCTION_EXISTS(strerror LWS_HAVE_STRERROR)
 CHECK_FUNCTION_EXISTS(vfork LWS_HAVE_VFORK)
 CHECK_FUNCTION_EXISTS(getifaddrs LWS_HAVE_GETIFADDRS)
+CHECK_FUNCTION_EXISTS(snprintf LWS_HAVE_SNPRINTF)
+CHECK_FUNCTION_EXISTS(_snprintf LWS_HAVE__SNPRINTF)
+CHECK_FUNCTION_EXISTS(_vsnprintf LWS_HAVE__VSNPRINTF)
 
 if (NOT LWS_HAVE_GETIFADDRS)
 	if (LWS_WITHOUT_BUILTIN_GETIFADDRS)
diff --git a/lib/private-libwebsockets.h b/lib/private-libwebsockets.h
index 0368cfd7..4c10b68c 100644
--- a/lib/private-libwebsockets.h
+++ b/lib/private-libwebsockets.h
@@ -84,6 +84,14 @@
 
 #ifdef _WIN32_WCE
 #define vsnprintf _vsnprintf
+#else
+#ifdef LWS_HAVE__VSNPRINTF
+#define vsnprintf _vsnprintf
+#endif
+#endif
+
+#ifdef LWS_HAVE__SNPRINTF
+#define snprintf _snprintf
 #endif
 
 #else /* not windows --> */