diff --git a/open-sse/translator/request/claude-to-kiro.js b/open-sse/translator/request/claude-to-kiro.js
index 972b0610..3cfad109 100644
--- a/open-sse/translator/request/claude-to-kiro.js
+++ b/open-sse/translator/request/claude-to-kiro.js
@@ -327,7 +327,6 @@ export function claudeToKiroRequest(model, body, stream, credentials) {
   };
 
   if (profileArn) payload.profileArn = profileArn;
-  if (systemPrompt) payload.systemPrompt = systemPrompt;
   if (additionalModelRequestFields) {
     payload.additionalModelRequestFields = additionalModelRequestFields;
   }
diff --git a/open-sse/translator/request/openai-to-kiro.js b/open-sse/translator/request/openai-to-kiro.js
index 3e30d2f5..1d9bedec 100644
--- a/open-sse/translator/request/openai-to-kiro.js
+++ b/open-sse/translator/request/openai-to-kiro.js
@@ -420,7 +420,6 @@ export function openaiToKiroRequest(model, body, stream, credentials) {
   if (profileArn) {
     payload.profileArn = profileArn;
   }
-  if (systemPrompt) payload.systemPrompt = systemPrompt;
   if (additionalModelRequestFields) {
     payload.additionalModelRequestFields = additionalModelRequestFields;
   }