diff --git a/include/QtCrypto/qpipe.h b/include/QtCrypto/qpipe.h
--- a/include/QtCrypto/qpipe.h
+++ b/include/QtCrypto/qpipe.h
@@ -45,7 +45,12 @@
 
 // defs adapted qprocess_p.h
 #ifdef Q_OS_WIN
+#pragma push_macro("NOMINMAX")
+#ifndef NOMINMAX
+# define NOMINMAX
+#endif
 #include <windows.h>
+#pragma pop_macro("NOMINMAX")
 typedef HANDLE Q_PIPE_ID;
 #define INVALID_Q_PIPE_ID INVALID_HANDLE_VALUE
 #else