diff --git a/.changeset/quick-weeks-explode.md b/.changeset/quick-weeks-explode.md
new file mode 100644
index 0000000000..fcc88263ec
--- /dev/null
+++ b/.changeset/quick-weeks-explode.md
@@ -0,0 +1,5 @@
+---
+'@backstage/backend-test-utils': patch
+---
+
+Remove third type parameter used for `MockInstance`, in order to be compatible with older versions of `@types/jest`.
diff --git a/packages/backend-test-utils/api-report.md b/packages/backend-test-utils/api-report.md
index 43e671e440..4a27ac21a9 100644
--- a/packages/backend-test-utils/api-report.md
+++ b/packages/backend-test-utils/api-report.md
@@ -210,10 +210,9 @@ export type ServiceMock<TService> = {
   factory: ServiceFactory<TService>;
 } & {
   [Key in keyof TService]: TService[Key] extends (
-    this: infer This,
     ...args: infer Args
   ) => infer Return
-    ? TService[Key] & jest.MockInstance<Return, Args, This>
+    ? TService[Key] & jest.MockInstance<Return, Args>
     : TService[Key];
 };
 
diff --git a/packages/backend-test-utils/src/next/services/mockServices.ts b/packages/backend-test-utils/src/next/services/mockServices.ts
index 22fba38fda..bd684f7560 100644
--- a/packages/backend-test-utils/src/next/services/mockServices.ts
+++ b/packages/backend-test-utils/src/next/services/mockServices.ts
@@ -64,10 +64,9 @@ export type ServiceMock<TService> = {
   factory: ServiceFactory<TService>;
 } & {
   [Key in keyof TService]: TService[Key] extends (
-    this: infer This,
     ...args: infer Args
   ) => infer Return
-    ? TService[Key] & jest.MockInstance<Return, Args, This>
+    ? TService[Key] & jest.MockInstance<Return, Args>
     : TService[Key];
 };