diff --git a/blocks/block.c b/blocks/block.c
index d2e4ec4..8dcdfcd 100644
--- a/blocks/block.c
+++ b/blocks/block.c
@@ -129,7 +129,7 @@ int ipfs_blocks_block_new(struct Block** block) {
 int ipfs_blocks_block_add_data(const unsigned char* data, size_t data_size, struct Block* block) {
 	// cid
 	unsigned char hash[32];
-	if (libp2p_crypto_hashing_sha256(data, data_size, &hash[0]) == 0) {
+	if (libp2p_crypto_hashing_sha256((char*)data, data_size, &hash[0]) == 0) {
 		return 0;
 	}
 
diff --git a/dnslink/dnslink.c b/dnslink/dnslink.c
index fbcf3b0..d3774cd 100644
--- a/dnslink/dnslink.c
+++ b/dnslink/dnslink.c
@@ -260,7 +260,7 @@ int ipfs_dnslink_resolve_n (char **p, char *d, int depth)
                 if (ns_parserr(&query_parse_msg,ns_s_an,i,&query_parse_rr)) {
                     return ErrResolveFailed;
                 } else {
-                    char *rdata = ns_rr_rdata(query_parse_rr);
+                    const unsigned char *rdata = ns_rr_rdata(query_parse_rr);
                     memcpy(p, rdata+1, *rdata); // first byte is record length
                     p += *rdata; // update pointer
                     *p++ = '\0'; // mark end-of-record and update pointer to next record.
diff --git a/merkledag/merkledag.c b/merkledag/merkledag.c
index fd2fdec..0f72837 100644
--- a/merkledag/merkledag.c
+++ b/merkledag/merkledag.c
@@ -35,7 +35,7 @@ int ipfs_merkledag_add(struct Node* node, struct FSRepo* fs_repo, size_t* bytes_
 		if (node->hash == NULL) {
 			return 0;
 		}
-		if (libp2p_crypto_hashing_sha256(protobuf, bytes_encoded, &node->hash[0]) == 0) {
+		if (libp2p_crypto_hashing_sha256((char*)protobuf, bytes_encoded, &node->hash[0]) == 0) {
 			free(node->hash);
 			return 0;
 		}
diff --git a/namesys/isdomain.c b/namesys/isdomain.c
index 5317070..19b35db 100644
--- a/namesys/isdomain.c
+++ b/namesys/isdomain.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <time.h>
diff --git a/unixfs/unixfs.c b/unixfs/unixfs.c
index 7eb4d76..23d054f 100644
--- a/unixfs/unixfs.c
+++ b/unixfs/unixfs.c
@@ -130,7 +130,7 @@ int ipfs_unixfs_add_data(unsigned char* data, size_t data_length, struct UnixFS*
 		free(unix_fs->bytes);
 		return 0;
 	}
-	if (libp2p_crypto_hashing_sha256(data, data_length, &unix_fs->hash[0]) == 0) {
+	if (libp2p_crypto_hashing_sha256((char*)data, data_length, &unix_fs->hash[0]) == 0) {
 		free(unix_fs->bytes);
 		free(unix_fs->hash);
 		return 0;