diff --git a/lib/doc/ja/Customization.lyx b/lib/doc/ja/Customization.lyx
index 02823c86b9..65b0f1815b 100644
--- a/lib/doc/ja/Customization.lyx
+++ b/lib/doc/ja/Customization.lyx
@@ -77,7 +77,7 @@ End
 \font_tt_scale 100
 
 \graphics default
-\default_output_format default
+\default_output_format dvi4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ja/DummyDocument1.lyx b/lib/doc/ja/DummyDocument1.lyx
index 7a6518683e..469ddbda7e 100644
--- a/lib/doc/ja/DummyDocument1.lyx
+++ b/lib/doc/ja/DummyDocument1.lyx
@@ -20,7 +20,7 @@
 \font_tt_scale 100
 
 \graphics default
-\default_output_format default
+\default_output_format dvi4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ja/DummyDocument2.lyx b/lib/doc/ja/DummyDocument2.lyx
index 070e132389..4d78ccde3d 100644
--- a/lib/doc/ja/DummyDocument2.lyx
+++ b/lib/doc/ja/DummyDocument2.lyx
@@ -20,7 +20,7 @@
 \font_tt_scale 100
 
 \graphics default
-\default_output_format default
+\default_output_format dvi4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ja/Formula-numbering.lyx b/lib/doc/ja/Formula-numbering.lyx
index 90d4c6b8e9..4e12875eb6 100644
--- a/lib/doc/ja/Formula-numbering.lyx
+++ b/lib/doc/ja/Formula-numbering.lyx
@@ -59,7 +59,7 @@
 \font_tt_scale 100
 
 \graphics default
-\default_output_format default
+\default_output_format dvi4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ja/LaTeXConfig.lyx b/lib/doc/ja/LaTeXConfig.lyx
index 65f6e0066b..23119d57ff 100644
--- a/lib/doc/ja/LaTeXConfig.lyx
+++ b/lib/doc/ja/LaTeXConfig.lyx
@@ -20,7 +20,7 @@
 \font_tt_scale 100
 
 \graphics default
-\default_output_format default
+\default_output_format dvi4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ja/Shortcuts.lyx b/lib/doc/ja/Shortcuts.lyx
index c4c0ad1246..a69259e3f2 100644
--- a/lib/doc/ja/Shortcuts.lyx
+++ b/lib/doc/ja/Shortcuts.lyx
@@ -20,7 +20,7 @@
 \font_tt_scale 100
 
 \graphics default
-\default_output_format default
+\default_output_format dvi4
 \output_sync 0
 \bibtex_command default
 \index_command default