diff --git a/doc/doxygen.cfg.in b/doc/doxygen.cfg.in
index 5333f6da..0604c8b2 100644
--- a/doc/doxygen.cfg.in
+++ b/doc/doxygen.cfg.in
@@ -128,7 +128,8 @@ PREDEFINED	 = DOXYGEN PIC "DOC_HIDDEN" \
 		   ALSA_PCM_NEW_HW_PARAMS_API \
 		   _POSIX_C_SOURCE \
 		   "use_default_symbol_version(x,y,z)=" \
-		   "link_warning(x,y)="
+		   "link_warning(x,y)=" \
+		   __attribute__((x))=
 
 OPTIMIZE_OUTPUT_FOR_C = YES	# doxygen 1.2.6 option
 TYPEDEF_HIDES_STRUCT = YES	# needed in doxygen >= 1.5.4
diff --git a/src/seq/seq.c b/src/seq/seq.c
index c4f218df..899dfe9f 100644
--- a/src/seq/seq.c
+++ b/src/seq/seq.c
@@ -1763,7 +1763,9 @@ int snd_seq_client_info_get_ump_group_enabled(const snd_seq_client_info_t *info,
 	return !(info->group_filter & (1U << group));
 }
 
+#ifndef DOC_HIDDEN
 #define UMP_GROUPLESS_FILTER	(1U << 0)
+#endif /* DOC_HIDDEN */
 
 /**
  * \brief Get the UMP groupless message handling status