diff --git a/crypto/bn/exptest.c b/crypto/bn/exptest.c
index 1ec61c2..4816344 100644
--- a/crypto/bn/exptest.c
+++ b/crypto/bn/exptest.c
@@ -69,9 +69,7 @@
 
 #define NUM_BITS	(BN_BITS*2)
 
-int main(argc,argv)
-int argc;
-char *argv[];
+int main(int argc, char *argv[])
 	{
 	BN_CTX *ctx;
 	BIO *out=NULL;