diff --git a/lsteamclient/steamclient_main.c b/lsteamclient/steamclient_main.c
index 9c1631da..514841d1 100644
--- a/lsteamclient/steamclient_main.c
+++ b/lsteamclient/steamclient_main.c
@@ -356,6 +356,10 @@ static void execute_pending_callbacks(void)
             TRACE( "CALL_CDECL_FUNC_DATA func %p, data %p.\n", params.callback->call_cdecl_func_data.pFunc, params.callback->call_cdecl_func_data.data );
             params.callback->call_cdecl_func_data.pFunc( params.callback->call_cdecl_func_data.data );
             break;
+        case CALL_STDCALL_FUNC_DATA:
+            TRACE( "CALL_STDCALL_FUNC_DATA func %p, data %p.\n", params.callback->call_stdcall_func_data.pFunc, params.callback->call_stdcall_func_data.data );
+            params.callback->call_stdcall_func_data.pFunc( params.callback->call_stdcall_func_data.data );
+            break;
         case CALL_IFACE_VTABLE_0:
             TRACE( "CALL_IFACE_VTABLE_0 iface %p, arg0 %#jx, arg1 %#jx, arg2 %#jx.\n", params.callback->call_iface_vtable.iface,
                    params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2 );
diff --git a/lsteamclient/unix_private.h b/lsteamclient/unix_private.h
index 150c801e..6f45791d 100644
--- a/lsteamclient/unix_private.h
+++ b/lsteamclient/unix_private.h
@@ -25,6 +25,8 @@ extern void queue_vtable_callback_0_rules_responded( struct w_steam_iface *w_ifa
 
 typedef void (*W_CDECL w_cdecl_func)( void * );
 extern void queue_cdecl_func_callback( w_cdecl_func func, void *data, uint32_t data_size );
+typedef void (*W_STDCALL w_stdcall_func)( void * );
+extern void queue_stdcall_func_callback( w_stdcall_func func, void *data, uint32_t data_size );
 
 extern uint32_t manual_convert_nNativeKeyCode( uint32_t win_vk );
 
diff --git a/lsteamclient/unix_steam_input_manual.cpp b/lsteamclient/unix_steam_input_manual.cpp
index 2080810e..c1c56011 100644
--- a/lsteamclient/unix_steam_input_manual.cpp
+++ b/lsteamclient/unix_steam_input_manual.cpp
@@ -315,9 +315,9 @@ NTSTATUS ISteamInput_SteamInput002_GetGlyphForXboxOrigin( void *args )
 /* ISteamInput_SteamInput005 */
 
 static void (W_STDCALL *w_EnableActionEventCallbacks_152)( SteamInputActionEvent_t * );
-static void u_SteamInputActionEventCallbackPointer_152( SteamInputActionEvent_t *dat )
+static void U_STDCALL u_SteamInputActionEventCallbackPointer_152( SteamInputActionEvent_t *dat )
 {
-    if (w_EnableActionEventCallbacks_152) w_EnableActionEventCallbacks_152( dat );
+    if (w_EnableActionEventCallbacks_152) queue_stdcall_func_callback( (w_stdcall_func)w_EnableActionEventCallbacks_152, dat, sizeof(*dat) );
 }
 
 NTSTATUS ISteamInput_SteamInput005_EnableActionEventCallbacks( void *args )
diff --git a/lsteamclient/unixlib.cpp b/lsteamclient/unixlib.cpp
index 34f82624..dd057d83 100644
--- a/lsteamclient/unixlib.cpp
+++ b/lsteamclient/unixlib.cpp
@@ -123,6 +123,26 @@ void queue_cdecl_func_callback( w_cdecl_func func, void *data, uint32_t data_siz
     pthread_mutex_unlock( &callbacks_lock );
 }
 
+void queue_stdcall_func_callback( w_stdcall_func func, void *data, uint32_t data_size )
+{
+    uint32_t size = data_size;
+    struct callback_entry *entry;
+
+    size += sizeof(struct callback_entry);
+    if (!(entry = (struct callback_entry *)malloc( size ))) return;
+
+    entry->callback.type = CALL_STDCALL_FUNC_DATA;
+    size -= offsetof( struct callback_entry, callback );
+    entry->callback.size = size;
+
+    entry->callback.call_stdcall_func_data.pFunc = func;
+    memcpy( (char *)entry->callback.call_stdcall_func_data.data, data, data_size );
+
+    pthread_mutex_lock( &callbacks_lock );
+    list_add_tail( &callbacks, &entry->entry );
+    pthread_mutex_unlock( &callbacks_lock );
+}
+
 u_FSteamNetworkingSocketsDebugOutput manual_convert_SetDebugOutputFunction_pfnFunc( w_FSteamNetworkingSocketsDebugOutput w_func )
 {
     w_steam_networking_socket_debug_output = w_func;
diff --git a/lsteamclient/unixlib.h b/lsteamclient/unixlib.h
index c3521006..6295c147 100644
--- a/lsteamclient/unixlib.h
+++ b/lsteamclient/unixlib.h
@@ -35,6 +35,7 @@ enum callback_type
     SOCKETS_DEBUG_OUTPUT = 1,
     WARNING_MESSAGE_HOOK,
     CALL_CDECL_FUNC_DATA,
+    CALL_STDCALL_FUNC_DATA,
     CALL_IFACE_VTABLE_0,
     CALL_IFACE_VTABLE_1,
     CALL_IFACE_VTABLE_2,
@@ -69,6 +70,12 @@ struct callback
             unsigned char data[1];
         } call_cdecl_func_data;
 
+        struct
+        {
+            void (*W_STDCALL pFunc)( void * );
+            unsigned char data[1];
+        } call_stdcall_func_data;
+
         struct
         {
             struct w_steam_iface *iface;