diff --git a/src/ConductorSharp.Engine/Util/ExpressionUtil.cs b/src/ConductorSharp.Engine/Util/ExpressionUtil.cs
index 7385541b..97c00d2a 100644
--- a/src/ConductorSharp.Engine/Util/ExpressionUtil.cs
+++ b/src/ConductorSharp.Engine/Util/ExpressionUtil.cs
@@ -34,7 +34,7 @@ public static Type ParseToType(Expression expression)
         private static object ParseExpression(Expression expression)
         {
             if (expression is ConstantExpression cex)
-                return Convert.ToString(cex.Value);
+                return cex.Value;
 
             if (expression is UnaryExpression uex && uex.Operand is ConstantExpression ccex)
             {
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/Arrays.json b/test/ConductorSharp.Engine.Tests/Samples/Workflows/Arrays.json
index 406ec2a9..c6fa6333 100644
--- a/test/ConductorSharp.Engine.Tests/Samples/Workflows/Arrays.json
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/Arrays.json
@@ -15,9 +15,9 @@
       "description": "{\"description\":null}",
       "inputParameters": {
         "integers": [
-          "1",
-          "2",
-          "3"
+          1,
+          2,
+          3
         ],
         "models": [
           {
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/NestedObjects.json b/test/ConductorSharp.Engine.Tests/Samples/Workflows/NestedObjects.json
index 0b7d6e80..60fbbd0f 100644
--- a/test/ConductorSharp.Engine.Tests/Samples/Workflows/NestedObjects.json
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/NestedObjects.json
@@ -15,10 +15,10 @@
       "description": "{\"description\":null}",
       "inputParameters": {
         "nested_objects": {
-          "integer": "1",
+          "integer": 1,
           "string": "test",
           "object": {
-            "integer": "1",
+            "integer": 1,
             "string": "string",
             "object": {
               "nested_input": "1"