diff --git a/examples/main/main.cpp b/examples/main/main.cpp
index ef9e75fab..a051fcbc5 100644
--- a/examples/main/main.cpp
+++ b/examples/main/main.cpp
@@ -23,7 +23,9 @@
 #include <unistd.h>
 #elif defined (_WIN32)
 #define WIN32_LEAN_AND_MEAN
+#ifndef NOMINMAX
 #define NOMINMAX
+#endif
 #include <windows.h>
 #include <signal.h>
 #endif