diff --git a/src/hashes/chc/chc.c b/src/hashes/chc/chc.c
index 332d0258..31e63e61 100644
--- a/src/hashes/chc/chc.c
+++ b/src/hashes/chc/chc.c
@@ -156,8 +156,8 @@ static int chc_compress(hash_state *md, unsigned char *buf)
 }
 
 /* function for processing blocks */
-int _chc_process(hash_state * md, const unsigned char *buf, unsigned long len);
-HASH_PROCESS(_chc_process, chc_compress, chc, (unsigned long)cipher_blocksize)
+static int _chc_process(hash_state * md, const unsigned char *buf, unsigned long len);
+static HASH_PROCESS(_chc_process, chc_compress, chc, (unsigned long)cipher_blocksize)
 
 /**
    Process a block of memory though the hash