diff --git a/contrib/kaitai-struct-files/files/alpha__constants.ksy b/contrib/kaitai-struct-files/files/alpha__constants.ksy
index ea6dbc136a105d6ee935c9f98f6682cbee2178f0..dcf100fd8c7e2824f491be05902911c0389e0dd1 100644
--- a/contrib/kaitai-struct-files/files/alpha__constants.ksy
+++ b/contrib/kaitai-struct-files/files/alpha__constants.ksy
@@ -44,11 +44,11 @@ types:
       type: u1
       enum: bool
     - id: number_of_slots
-      type: s2
+      type: u2
     - id: attestation_lag
-      type: s2
+      type: u1
     - id: attestation_threshold
-      type: s2
+      type: u1
     - id: redundancy_factor
       type: u1
     - id: page_size
diff --git a/contrib/kaitai-struct-files/files/alpha__constants__parametric.ksy b/contrib/kaitai-struct-files/files/alpha__constants__parametric.ksy
index fde9e41fd9ed4e5bb932483e26f5d50c218f11a5..b187e1770c59a3856cf4843df6b900cf2dc1e113 100644
--- a/contrib/kaitai-struct-files/files/alpha__constants__parametric.ksy
+++ b/contrib/kaitai-struct-files/files/alpha__constants__parametric.ksy
@@ -44,11 +44,11 @@ types:
       type: u1
       enum: bool
     - id: number_of_slots
-      type: s2
+      type: u2
     - id: attestation_lag
-      type: s2
+      type: u1
     - id: attestation_threshold
-      type: s2
+      type: u1
     - id: redundancy_factor
       type: u1
     - id: page_size
diff --git a/contrib/kaitai-struct-files/files/alpha__parameters.ksy b/contrib/kaitai-struct-files/files/alpha__parameters.ksy
index 9752e50d273a0ed09fedc178fd6cb3c6a22abc14..23d37f392b7e3e09e2616c42fcb34973e8279d71 100644
--- a/contrib/kaitai-struct-files/files/alpha__parameters.ksy
+++ b/contrib/kaitai-struct-files/files/alpha__parameters.ksy
@@ -178,11 +178,11 @@ types:
       type: u1
       enum: bool
     - id: number_of_slots
-      type: s2
+      type: u2
     - id: attestation_lag
-      type: s2
+      type: u1
     - id: attestation_threshold
-      type: s2
+      type: u1
     - id: redundancy_factor
       type: u1
     - id: page_size
diff --git a/src/proto_alpha/lib_protocol/constants_parametric_repr.ml b/src/proto_alpha/lib_protocol/constants_parametric_repr.ml
index 345a9ed22897bde583fb0f0b0ff418b400a6f455..8bac5ec48cb187186116a92b04b61ef522aca72b 100644
--- a/src/proto_alpha/lib_protocol/constants_parametric_repr.ml
+++ b/src/proto_alpha/lib_protocol/constants_parametric_repr.ml
@@ -69,9 +69,9 @@ let dal_encoding =
        (obj5
           (req "feature_enable" bool)
           (req "incentives_enable" bool)
-          (req "number_of_slots" int16)
-          (req "attestation_lag" int16)
-          (req "attestation_threshold" int16))
+          (req "number_of_slots" uint16)
+          (req "attestation_lag" uint8)
+          (req "attestation_threshold" uint8))
        Dal.parameters_encoding)
 
 (* The encoded representation of this type is stored in the context as