diff --git a/include/blowfish.h b/include/blowfish.h
index a6981c2635080238887da6890b283e8c14db3f43..dce695233bc29387466786e65c21b03b2a5db751 100644
--- a/include/blowfish.h
+++ b/include/blowfish.h
@@ -40,12 +40,12 @@ typedef struct {
 } BLOWFISH_context;
 
 
-CONST char *
+const char *
 blowfish_get_info( int algo, size_t *keylen,
 		   size_t *blocksize, size_t *contextsize,
-		   int	(**setkey)( void *c, CONST byte *key, unsigned keylen ),
-		   void (**encrypt)( void *c, byte *outbuf, CONST byte *inbuf ),
-		   void (**decrypt)( void *c, byte *outbuf, CONST byte *inbuf )
+		   int	(**setkey)( void *c, const byte *key, unsigned keylen ),
+		   void (**encrypt)( void *c, byte *outbuf, const byte *inbuf ),
+		   void (**decrypt)( void *c, byte *outbuf, const byte *inbuf )
 		 );
 
 #endif /*G10_BLOWFISH_H*/
diff --git a/include/idea.h b/include/idea.h
index b19cbaebcdfdefced627e00fad291a6a1009a274..15c007a846737f4542378577634d00ca8fe8223b 100644
--- a/include/idea.h
+++ b/include/idea.h
@@ -19,13 +19,13 @@
 #include "crypto_types.h"
 
 void idea_expand(UINT16 *ctx,
-		 CONST UINT8 *key);
+		 const UINT8 *key);
 
 void idea_invert(UINT16 *d,
-		 CONST UINT16 *e);
+		 const UINT16 *e);
 
-void idea_crypt(CONST UINT16 *ctx,
+void idea_crypt(const UINT16 *ctx,
 		UINT8 *dest,
-		CONST UINT8 *src);
+		const UINT8 *src);
 
 #endif /* IDEA_H_INCLUDED */
diff --git a/include/rc4.h b/include/rc4.h
index 32bbf5cad88120dde705fbb2d6b663b8cbef23a3..3e9827d55ae458ba8984690f2ae4339dda7b6d59 100644
--- a/include/rc4.h
+++ b/include/rc4.h
@@ -16,7 +16,7 @@ struct rc4_ctx {
 void rc4_init(struct rc4_ctx *ctx);
 #endif
 
-void rc4_set_key(struct rc4_ctx *ctx, CONST UINT8 *key, UINT32 len);
-void rc4_crypt(struct rc4_ctx *ctx, UINT8 *dest, CONST UINT8 *src, UINT32 len);
+void rc4_set_key(struct rc4_ctx *ctx, const UINT8 *key, UINT32 len);
+void rc4_crypt(struct rc4_ctx *ctx, UINT8 *dest, const UINT8 *src, UINT32 len);
 
 #endif /* RC4_H_INCLUDED */