diff --git a/packages/tools/src/stringTools.ts b/packages/tools/src/stringTools.ts
index 7f2cd87d8..c5f24f690 100644
--- a/packages/tools/src/stringTools.ts
+++ b/packages/tools/src/stringTools.ts
@@ -725,6 +725,9 @@ export function deserializeJsTypesFromJsonParse(obj) {
     if (value?.$bigint) {
       return BigInt(value.$bigint);
     }
+    if (value?.$decimal) {
+      return value.$decimal;
+    }
   });
 }
 
@@ -739,6 +742,9 @@ export function deserializeJsTypesReviver(key, value) {
   if (value?.$bigint) {
     return BigInt(value.$bigint);
   }
+  if (value?.$decimal) {
+    return value.$decimal;
+  }
   return value;
 }