diff --git a/desdata.c b/desdata.c
index c078e86e99fbe832aae225f34226630efe48c2d8..bf37ec18439e2b0daaf95d461c1aecb45cd4be8d 100644
--- a/desdata.c
+++ b/desdata.c
@@ -11,15 +11,14 @@
  *
  */
 
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include	"desinfo.h"
 
 #include	"desCode.h"
 
-#if __GNUC__
-# define UNUSED __attribute__ ((__unused__))
-#else
-# define UNUSED
-#endif
 
 /* list of weak and semi-weak keys
 
diff --git a/shadata.c b/shadata.c
index 6934b51a9b81560032ac60b6d52910bd820e51c4..d898c6650c5a98b5e0d7acd3f8a61b28d637eda6 100644
--- a/shadata.c
+++ b/shadata.c
@@ -1,3 +1,6 @@
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
 
 #include <math.h>
 #include <stdio.h>
@@ -13,7 +16,7 @@ static const unsigned primes[64] =
   283, 293, 307, 311
 };
 
-int main(int argc, char **argv)
+int main(int argc UNUSED, char **argv UNUSED)
 {
   int i;
   static const double third = 1.0/3;