diff --git a/packages/core/src/resources/IssueLinks.ts b/packages/core/src/resources/IssueLinks.ts
index 7cb0a731..9be90f94 100644
--- a/packages/core/src/resources/IssueLinks.ts
+++ b/packages/core/src/resources/IssueLinks.ts
@@ -70,7 +70,7 @@ export class IssueLinks<C extends boolean = false> extends BaseResource<C> {
       endpoint`projects/${projectId}/issues/${issueIId}/links`,
       {
         targetProjectId,
-        targetIssueIId,
+        targetIssueIid: targetIssueIId,
         ...options,
       },
     );
diff --git a/packages/core/src/resources/LinkedEpics.ts b/packages/core/src/resources/LinkedEpics.ts
index 6977c1fd..7c80c94e 100644
--- a/packages/core/src/resources/LinkedEpics.ts
+++ b/packages/core/src/resources/LinkedEpics.ts
@@ -53,7 +53,7 @@ export class LinkedEpics<C extends boolean = false> extends BaseResource<C> {
       {
         searchParams: {
           targetGroupId,
-          targetEpicIId,
+          targetEpicIid: targetEpicIId,
         },
         ...options,
       },