diff --git a/include/sha512.h b/include/sha512.h
index 68b636d..0e5507f 100644
--- a/include/sha512.h
+++ b/include/sha512.h
@@ -27,12 +27,12 @@ typedef struct sha512_functions_ {
 } sha512_functions;
 extern sha512_functions _ed_sha512_functions;
 
-void _ed_sha512_validate() {
+inline void _ed_sha512_validate() {
 	assert(_ed_sha512_functions._ed_sha512_init);
 	assert(_ed_sha512_functions._ed_sha512_final);
 	assert(_ed_sha512_functions._ed_sha512_update);
 }
-int _ed_sha512(const unsigned char *message, size_t message_len, unsigned char *out) {
+inline int _ed_sha512(const unsigned char *message, size_t message_len, unsigned char *out) {
 	_ed_sha512_validate();
 
 	int result = 1;
diff --git a/src/sha512.c b/src/sha512.c
index bdcb972..36ef024 100644
--- a/src/sha512.c
+++ b/src/sha512.c
@@ -270,7 +270,7 @@ int _ed_sha512(const unsigned char *message, size_t message_len, unsigned char *
 	return 0;
 }
 
-extern sha512_functions _ed_sha512_functions = {
+sha512_functions _ed_sha512_functions = {
 		_ed_sha512_init,
 		_ed_sha512_final,
 		_ed_sha512_update
diff --git a/src/sha512_openssl.c b/src/sha512_openssl.c
index a3a9712..5a1384b 100644
--- a/src/sha512_openssl.c
+++ b/src/sha512_openssl.c
@@ -14,7 +14,7 @@ int _ed_sha512_update(sha512_context * md, const unsigned char *in, size_t inlen
 	return SHA512_Update(md, in, inlen) != 1; /* Returns 0 on success */
 }
 
-extern sha512_functions _ed_sha512_functions = {
+sha512_functions _ed_sha512_functions = {
 		_ed_sha512_init,
 		_ed_sha512_final,
 		_ed_sha512_update