diff --git a/formats/params_pass_array_str.ksy b/formats/params_pass_array_str.ksy
index 2caaa811d..691ff6f42 100644
--- a/formats/params_pass_array_str.ksy
+++ b/formats/params_pass_array_str.ksy
@@ -1,6 +1,6 @@
 meta:
   id: params_pass_array_str
-  encoding: ascii
+  encoding: ASCII
 seq:
   - id: str_array
     type: str
diff --git a/formats/valid_long.ksy b/formats/valid_long.ksy
index 3a328a61f..c95e247ba 100644
--- a/formats/valid_long.ksy
+++ b/formats/valid_long.ksy
@@ -1,6 +1,6 @@
 meta:
   id: valid_long
-  encoding: utf-8
+  encoding: UTF-8
   endian: le
 seq:
   - id: magic1
diff --git a/formats/valid_short.ksy b/formats/valid_short.ksy
index 259284ad6..6888ec8e0 100644
--- a/formats/valid_short.ksy
+++ b/formats/valid_short.ksy
@@ -1,6 +1,6 @@
 meta:
   id: valid_short
-  encoding: utf-8
+  encoding: UTF-8
   endian: le
 seq:
   - id: magic1