diff --git a/print.c b/print.c
index d4cafb8..b8d62a6 100644
--- a/print.c
+++ b/print.c
@@ -42,7 +42,8 @@
 	/* Tell Windows which version of the structure we want. */
 	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
 	if (GetVersionEx((OSVERSIONINFO*) &osvi))
-		msg_ginfo(" %lu.%lu", osvi.dwMajorVersion, osvi.dwMinorVersion);
+		msg_ginfo(" %lu.%lu", (unsigned long)osvi.dwMajorVersion,
+			(unsigned long)osvi.dwMinorVersion);
 	else
 		msg_ginfo(" unknown version");
 	GetSystemInfo(&si);