diff --git a/include/backend.h b/include/backend.h
index 117452740..ce1e9cfe4 100644
--- a/include/backend.h
+++ b/include/backend.h
@@ -93,7 +93,9 @@ int run_kernel_decompress                   (hashcat_ctx_t *hashcat_ctx, hc_devi
 int run_copy                                (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_param, const u64 pws_cnt);
 int run_cracker                             (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_param, const u64 pws_pos, const u64 pws_cnt);
 
+HC_API_CALL
 void *hook12_thread (void *p);
+HC_API_CALL
 void *hook23_thread (void *p);
 
 #endif // HC_BACKEND_H
diff --git a/include/brain.h b/include/brain.h
index 9ad0b5c1a..783a0d4cc 100644
--- a/include/brain.h
+++ b/include/brain.h
@@ -240,7 +240,9 @@ int   brain_server_sort_hash_long       (const void *v1, const void *v2);
 int   brain_server_sort_hash_short      (const void *v1, const void *v2);
 int   brain_server_sort_hash_unique     (const void *v1, const void *v2);
 void  brain_server_handle_signal        (int signo);
+HC_API_CALL
 void *brain_server_handle_client        (void *p);
+HC_API_CALL
 void *brain_server_handle_dumps         (void *p);
 void  brain_server_db_hash_init         (brain_server_db_hash_t *brain_server_db_hash, const u32 brain_session);
 bool  brain_server_db_hash_realloc      (brain_server_db_hash_t *brain_server_db_hash, const i64 new_long_cnt);