diff --git a/core/encoding/json/marshal.odin b/core/encoding/json/marshal.odin
index e6c8fba38..e467536cc 100644
--- a/core/encoding/json/marshal.odin
+++ b/core/encoding/json/marshal.odin
@@ -782,6 +782,7 @@ cast_any_int_to_u128 :: proc(any_int_value: any) -> u128 {
 	case i16le:  u = u128(i)
 	case i32le:  u = u128(i)
 	case i64le:  u = u128(i)
+	case i128le: u = u128(i)
 	case u16le:  u = u128(i)
 	case u32le:  u = u128(i)
 	case u64le:  u = u128(i)
@@ -790,6 +791,7 @@ cast_any_int_to_u128 :: proc(any_int_value: any) -> u128 {
 	case i16be:  u = u128(i)
 	case i32be:  u = u128(i)
 	case i64be:  u = u128(i)
+	case i128be: u = u128(i)
 	case u16be:  u = u128(i)
 	case u32be:  u = u128(i)
 	case u64be:  u = u128(i)