diff --git a/e_os.h b/e_os.h
index 4d5e9f92a6ae3d99076b22dc858960e91721325b..0b2b1cca67e5b0aa78c68eb39fbf8a4a4423f8de 100644
--- a/e_os.h
+++ b/e_os.h
@@ -227,6 +227,7 @@ extern "C" {
 #    define _setmode setmode
 #    define _O_TEXT O_TEXT
 #    define _O_BINARY O_BINARY
+#    undef DEVRANDOM
 #    define DEVRANDOM "/dev/urandom\x24"
 #  endif /* __DJGPP__ */