diff --git a/crypto/cast/c_cfb64.c b/crypto/cast/c_cfb64.c
index 095e05a563a42ceb3fd88f0fb61ce258f90fdb1f..514c005c325f9326b5b405d280762f3822d3e0d1 100644
--- a/crypto/cast/c_cfb64.c
+++ b/crypto/cast/c_cfb64.c
@@ -66,7 +66,7 @@
 
 void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out,
 			long length, CAST_KEY *schedule, unsigned char *ivec,
-			int *num, int _encrypt)
+			int *num, int enc)
 	{
 	register CAST_LONG v0,v1,t;
 	register int n= *num;
@@ -75,7 +75,7 @@ void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out,
 	unsigned char *iv,c,cc;
 
 	iv=ivec;
-	if (_encrypt)
+	if (enc)
 		{
 		while (l--)
 			{
diff --git a/crypto/cast/c_ecb.c b/crypto/cast/c_ecb.c
index e237ebcac43356fcb91950ad7b7d85272abfb0ea..33182f2b7126191836dc84a852e98d233602b7c2 100644
--- a/crypto/cast/c_ecb.c
+++ b/crypto/cast/c_ecb.c
@@ -63,13 +63,13 @@
 char *CAST_version="CAST" OPENSSL_VERSION_PTEXT;
 
 void CAST_ecb_encrypt(const unsigned char *in, unsigned char *out,
-		      CAST_KEY *ks, int _encrypt)
+		      CAST_KEY *ks, int enc)
 	{
 	CAST_LONG l,d[2];
 
 	n2l(in,l); d[0]=l;
 	n2l(in,l); d[1]=l;
-	if (_encrypt)
+	if (enc)
 		CAST_encrypt(d,ks);
 	else
 		CAST_decrypt(d,ks);
diff --git a/crypto/cast/c_enc.c b/crypto/cast/c_enc.c
index ef70c8898121642febcce7162c8aa67a0ca06ccb..0fe2cffeccffacac0d4f266cf16e83927b566464 100644
--- a/crypto/cast/c_enc.c
+++ b/crypto/cast/c_enc.c
@@ -124,14 +124,14 @@ void CAST_decrypt(CAST_LONG *data, CAST_KEY *key)
 	}
 
 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
-	     CAST_KEY *ks, unsigned char *iv, int _encrypt)
+	     CAST_KEY *ks, unsigned char *iv, int enc)
 	{
 	register CAST_LONG tin0,tin1;
 	register CAST_LONG tout0,tout1,xor0,xor1;
 	register long l=length;
 	CAST_LONG tin[2];
 
-	if (_encrypt)
+	if (enc)
 		{
 		n2l(iv,tout0);
 		n2l(iv,tout1);