diff --git a/tests/verbs.test.ts b/tests/verbs.test.ts
index 8c40e10..e6a3b06 100644
--- a/tests/verbs.test.ts
+++ b/tests/verbs.test.ts
@@ -250,5 +250,6 @@ describe("Participle", () => {
     expect(find(traho)).toBe("tractus, tracta, tractum");
     expect(find(fugio)).toBe("fugitus, fugita, fugitum");
     expect(find(invenio)).toBe("inventus, inventa, inventum");
+    expect(saevio.participle?.passive).not.toHaveProperty("perfect");
   });
 });
diff --git a/verbs/index.ts b/verbs/index.ts
index 1060c2a..aac1b02 100644
--- a/verbs/index.ts
+++ b/verbs/index.ts
@@ -2,7 +2,7 @@ import deepMapValues from "just-deep-map-values";
 import extend from "just-extend";
 import formatStringTemplate from "string-template";
 import { getConjugation, PrincipalParts, type Shape as VerbShape } from "./utils";
-import verbTemplate from "./template";
+import * as templates from "./template";
 import { z } from "zod";
 
 const Overrides: z.ZodType<VerbShape, z.ZodTypeDef, VerbShape | undefined> = z.record(z.string(), z.unknown()).default({});
@@ -30,6 +30,8 @@ export default (principalParts: z.infer<typeof PrincipalParts>, optionsInput?: V
   const presentStemB = conjugation >= 3 ? `${presentActiveIndicative.slice(0, -1)}u` : presentStem;
   const presentStemC = conjugation > 3 ? `${presentActiveIndicative.slice(0, -1)}e` : presentStem;
 
+  const verbTemplate = perfectPassiveStem ? templates.withPerfectPassiveStem : templates.withoutPerfectPassiveStem;
+
   const verb = deepMapValues(verbTemplate, template => {
     return formatStringTemplate(template, {
       presentActiveIndicative,
@@ -43,4 +45,4 @@ export default (principalParts: z.infer<typeof PrincipalParts>, optionsInput?: V
   });
 
   return extend(true, verb, options.overrides) as VerbShape;
-}
+};
diff --git a/verbs/template.ts b/verbs/template.ts
index 6648554..6b1cb87 100644
--- a/verbs/template.ts
+++ b/verbs/template.ts
@@ -1,6 +1,6 @@
 import type { Shape as VerbShape } from "./utils";
 
-export default {
+export const withoutPerfectPassiveStem = {
   indicative: {
     active: {
       present: {
@@ -106,7 +106,16 @@ export default {
   participle: {
     active: {
       present: "{presentStemC}ns, {presentStemC}ntis"
-    },
+    }
+  }
+} satisfies VerbShape;
+
+export const withPerfectPassiveStem = {
+  ...withoutPerfectPassiveStem,
+
+  participle: {
+    ...withoutPerfectPassiveStem.participle,
+
     passive: {
       perfect: "{perfectPassiveStem}us, {perfectPassiveStem}a, {perfectPassiveStem}um"
     }