diff --git a/doc/source/programs/gdaltindex.rst b/doc/source/programs/gdaltindex.rst
index 6dd1668c30d2..a9e8a0b8cb87 100644
--- a/doc/source/programs/gdaltindex.rst
+++ b/doc/source/programs/gdaltindex.rst
@@ -330,7 +330,7 @@ Examples
 
 ::
 
-    gdaltindex tile_index.gti.gpkg -datatype Byte -tr 60 60 -colorinterp Red,Green,Blue --optfile my_list.txt
+    gdaltindex tile_index.gti.gpkg -ot Byte -tr 60 60 -colorinterp Red,Green,Blue --optfile my_list.txt
 
 C API
 -----