diff --git a/doc/salome/tui/doxyfile.in b/doc/salome/tui/doxyfile.in
index 4966b4729..8b7feba7a 100755
--- a/doc/salome/tui/doxyfile.in
+++ b/doc/salome/tui/doxyfile.in
@@ -250,7 +250,7 @@ INCLUDED_BY_GRAPH      = NO
 CALL_GRAPH             = NO
 GRAPHICAL_HIERARCHY    = YES
 DIRECTORY_GRAPH        = YES
-DOT_IMAGE_FORMAT       = jpg
+DOT_IMAGE_FORMAT       = png
 DOT_FONTNAME           = Arial
 DOT_PATH               = 
 DOTFILE_DIRS           =