diff --git a/internal/machine/vm/run.go b/internal/machine/vm/run.go
index a437806b8..d9fd4dad8 100644
--- a/internal/machine/vm/run.go
+++ b/internal/machine/vm/run.go
@@ -35,7 +35,12 @@ func (s ScriptV1) ToCore() Script {
 		case string:
 			s.Script.Vars[k] = v
 		case map[string]any:
-			s.Script.Vars[k] = fmt.Sprintf("%s %v", v["asset"], v["amount"])
+			switch amount := v["amount"].(type) {
+			case string:
+				s.Script.Vars[k] = fmt.Sprintf("%s %s", v["asset"], amount)
+			case float64:
+				s.Script.Vars[k] = fmt.Sprintf("%s %d", v["asset"], int(amount))
+			}
 		default:
 			s.Script.Vars[k] = fmt.Sprint(v)
 		}
diff --git a/internal/machine/vm/run_test.go b/internal/machine/vm/run_test.go
index f74b6b756..0ef310460 100644
--- a/internal/machine/vm/run_test.go
+++ b/internal/machine/vm/run_test.go
@@ -451,3 +451,59 @@ func TestRun(t *testing.T) {
 		})
 	}
 }
+
+func TestConvertScriptV1(t *testing.T) {
+	t.Parallel()
+
+	type testCase struct {
+		name      string
+		inputVars map[string]any
+		expected  map[string]string
+	}
+
+	testCases := []testCase{
+		{
+			name: "float64 conversion",
+			inputVars: map[string]any{
+				"amount": map[string]any{
+					"asset":  "USD",
+					"amount": float64(999999999999999),
+				},
+			},
+			expected: map[string]string{
+				"amount": "USD 999999999999999",
+			},
+		},
+		{
+			name: "big int conversion",
+			inputVars: map[string]any{
+				"amount": map[string]any{
+					"asset": "USD",
+					"amount": func() string {
+						ret, _ := big.NewInt(0).SetString("9999999999999999999999999999999999999999", 10)
+						return ret.String()
+					}(),
+				},
+			},
+			expected: map[string]string{
+				"amount": "USD 9999999999999999999999999999999999999999",
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			script := ScriptV1{
+				Script: Script{
+					Plain: ``,
+				},
+				Vars: tc.inputVars,
+			}
+
+			converted := script.ToCore()
+			require.Equal(t, tc.expected, converted.Vars)
+		})
+	}
+}