diff --git a/src/backend.c b/src/backend.c
index 1adaf22c3..f6cda270c 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -16462,7 +16462,7 @@ int backend_session_update_mp_rl (hashcat_ctx_t *hashcat_ctx, const u32 css_cnt_
   return 0;
 }
 
-void *hook12_thread (void *p)
+HC_API_CALL void *hook12_thread (void *p)
 {
   hook_thread_param_t *hook_thread_param = (hook_thread_param_t *) p;
 
@@ -16486,7 +16486,7 @@ void *hook12_thread (void *p)
   return NULL;
 }
 
-void *hook23_thread (void *p)
+HC_API_CALL void *hook23_thread (void *p)
 {
   hook_thread_param_t *hook_thread_param = (hook_thread_param_t *) p;
 
diff --git a/src/brain.c b/src/brain.c
index bc55c131a..17592016b 100644
--- a/src/brain.c
+++ b/src/brain.c
@@ -2003,7 +2003,7 @@ void brain_server_handle_signal (int signo)
   }
 }
 
-void *brain_server_handle_dumps (void *p)
+HC_API_CALL void *brain_server_handle_dumps (void *p)
 {
   brain_server_dumper_options_t *brain_server_dumper_options = (brain_server_dumper_options_t *) p;
 
@@ -2035,7 +2035,7 @@ void *brain_server_handle_dumps (void *p)
   return NULL;
 }
 
-void *brain_server_handle_client (void *p)
+HC_API_CALL void *brain_server_handle_client (void *p)
 {
   brain_server_client_options_t *brain_server_client_options = (brain_server_client_options_t *) p;