diff --git a/src/Core__Array.res b/src/Core__Array.res
index a80a8e10..2c615c5f 100644
--- a/src/Core__Array.res
+++ b/src/Core__Array.res
@@ -98,7 +98,7 @@ external copyWithin: (array<'a>, ~target: int, ~start: int, ~end: int) => array<
 @send external shift: array<'a> => option<'a> = "shift"
 
 @variadic @send
-external splice: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => unit = "splice"
+external splice: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => array<'a> = "splice"
 @variadic @send
 external toSpliced: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => array<'a> =
   "toSpliced"
diff --git a/src/Core__Array.resi b/src/Core__Array.resi
index 529aa9cd..4f27990a 100644
--- a/src/Core__Array.resi
+++ b/src/Core__Array.resi
@@ -254,7 +254,7 @@ Console.log(someArray) // [1, 2, 3]
 external sort: (array<'a>, ('a, 'a) => Core__Ordering.t) => unit = "sort"
 
 @variadic @send
-external splice: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => unit = "splice"
+external splice: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => array<'a> = "splice"
 
 @variadic @send
 external toSpliced: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => array<'a> =