diff --git a/glib/deprecated/gthread.h b/glib/deprecated/gthread.h
index a18a730d6..4988e0047 100644
--- a/glib/deprecated/gthread.h
+++ b/glib/deprecated/gthread.h
@@ -135,10 +135,12 @@ void     g_thread_foreach      (GFunc             thread_func,
 typedef struct
 {
   GMutex *mutex;
-#ifndef G_OS_WIN32
+#ifndef __GI_SCANNER__
+# ifndef G_OS_WIN32
   /* only for ABI compatibility reasons */
   pthread_mutex_t unused;
-#endif
+# endif /* !G_OS_WIN32 */
+#endif /* !__GI_SCANNER__ */
 } GStaticMutex GLIB_DEPRECATED_TYPE_IN_2_32_FOR(GMutex);
 
 #define g_static_mutex_lock(mutex) \
@@ -162,15 +164,17 @@ struct _GStaticRecMutex
   GStaticMutex mutex;
   guint depth;
 
+#ifndef __GI_SCANNER__
   /* ABI compat only */
   union {
-#ifdef G_OS_WIN32
+# ifdef G_OS_WIN32
     void *owner;
-#else
+# else
     pthread_t owner;
-#endif
+# endif /* !G_OS_WIN32 */
     gdouble dummy;
   } unused;
+#endif /* !__GI_SCANNER__ */
 } GLIB_DEPRECATED_TYPE_IN_2_32_FOR(GRecMutex);
 
 #define G_STATIC_REC_MUTEX_INIT { G_STATIC_MUTEX_INIT, 0, { 0 } } GLIB_DEPRECATED_MACRO_IN_2_32_FOR(g_rec_mutex_init)