diff --git a/lib/doc/ar/Intro.lyx b/lib/doc/ar/Intro.lyx
index 4c6b1e3358..114294f07f 100644
--- a/lib/doc/ar/Intro.lyx
+++ b/lib/doc/ar/Intro.lyx
@@ -42,7 +42,7 @@
 \font_sf_scale 100 100
 \font_tt_scale 100 100
 \graphics default
-\default_output_format default
+\default_output_format pdf4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ar/Shortcuts.lyx b/lib/doc/ar/Shortcuts.lyx
index bacb0f75aa..584d59c718 100644
--- a/lib/doc/ar/Shortcuts.lyx
+++ b/lib/doc/ar/Shortcuts.lyx
@@ -22,7 +22,7 @@
 \font_sf_scale 100 100
 \font_tt_scale 100 100
 \graphics default
-\default_output_format default
+\default_output_format pdf4
 \output_sync 0
 \bibtex_command default
 \index_command default