diff --git a/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/calculation.tsx b/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/calculation.tsx
index 5473e5b966..e8636033eb 100644
--- a/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/calculation.tsx
+++ b/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/calculation.tsx
@@ -45,7 +45,7 @@ export default class extends Instruction {
       ['x-validator'](value, rules, { form }) {
         const { values } = form;
         const { evaluate } = evaluators.get(values.engine) as Evaluator;
-        const exp = value.trim().replace(/{{([^{}]+)}}/g, ' 1 ');
+        const exp = value.trim().replace(/{{([^{}]+)}}/g, ' "1" ');
         try {
           evaluate(exp);
           return '';
diff --git a/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/condition.tsx b/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/condition.tsx
index 7d8158b68e..faa5818ff2 100644
--- a/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/condition.tsx
+++ b/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/condition.tsx
@@ -409,7 +409,7 @@ export default class extends Instruction {
       ['x-validator'](value, rules, { form }) {
         const { values } = form;
         const { evaluate } = evaluators.get(values.engine);
-        const exp = value.trim().replace(/{{([^{}]+)}}/g, ' 1 ');
+        const exp = value.trim().replace(/{{([^{}]+)}}/g, ' "1" ');
         try {
           evaluate(exp);
           return '';