diff --git a/src/React.re b/src/React.re
index ae8cd326e..fc8fe9319 100644
--- a/src/React.re
+++ b/src/React.re
@@ -905,7 +905,7 @@ module Experimental = {
   /* https://react.dev/reference/react/useOptimistic */
   [@mel.module "react"]
   external useOptimistic:
-    ('state, ('state, 'optimisticValue) => 'state) =>
+    ('state, [@mel.uncurry] (('state, 'optimisticValue) => 'state)) =>
     ('state, 'optimisticValue => unit) =
     "useOptimistic";
 
@@ -959,7 +959,12 @@ module Experimental = {
   /* https://react.dev/reference/react/useActionState */
   [@mel.module "react"]
   external useActionState:
-    (('state, FormData.t) => unit, 'state, ~permalink: bool=?) =>
+    (
+      [@mel.uncurry] (('state, FormData.t) => unit),
+      'state,
+      ~permalink: bool=?,
+      unit
+    ) =>
     ('state, formAction, bool) =
     "useActionState";
 };
diff --git a/src/React.rei b/src/React.rei
index 66b4de0ee..8a83eebe1 100644
--- a/src/React.rei
+++ b/src/React.rei
@@ -586,7 +586,7 @@ module Experimental: {
 
   [@mel.module "react"]
   external useOptimistic:
-    ('state, ('state, 'optimisticValue) => 'state) =>
+    ('state, [@mel.uncurry] (('state, 'optimisticValue) => 'state)) =>
     ('state, 'optimisticValue => unit) =
     "useOptimistic";
 
@@ -644,7 +644,12 @@ module Experimental: {
 
   [@mel.module "react"]
   external useActionState:
-    (('state, FormData.t) => unit, 'state, ~permalink: bool=?) =>
+    (
+      [@mel.uncurry] (('state, FormData.t) => unit),
+      'state,
+      ~permalink: bool=?,
+      unit
+    ) =>
     ('state, formAction, bool) =
     "useActionState";
 };