diff --git a/packages/core/src/aici.ts b/packages/core/src/aici.ts
index 20875d72df..b8528a4a11 100644
--- a/packages/core/src/aici.ts
+++ b/packages/core/src/aici.ts
@@ -4,7 +4,7 @@ import {
     LanguageModel,
 } from "./chat"
 import { PromptNode, visitNode } from "./promptdom"
-import { fromHex, logError, utf8Decode } from "./util"
+import { fromHex, logError, normalizeInt, utf8Decode } from "./util"
 import { AICI_CONTROLLER, TOOL_ID } from "./constants"
 import { host } from "./host"
 import { NotSupportedError, RequestError } from "./error"
@@ -248,7 +248,7 @@ const AICIChatCompletion: ChatCompletionHandler = async (
             r.statusText,
             bodyJSON?.error,
             body,
-            parseInt(r.headers.get("retry-after"))
+            normalizeInt(r.headers.get("retry-after"))
         )
     }
 
diff --git a/packages/core/src/openai.ts b/packages/core/src/openai.ts
index 370e399142..482fc217e2 100644
--- a/packages/core/src/openai.ts
+++ b/packages/core/src/openai.ts
@@ -1,4 +1,4 @@
-import { logError, logVerbose } from "./util"
+import { logError, logVerbose, normalizeInt } from "./util"
 import { host } from "./host"
 import {
     AZURE_OPENAI_API_VERSION,
@@ -150,7 +150,7 @@ export const OpenAIChatCompletion: ChatCompletionHandler = async (
             r.statusText,
             bodyJSON?.error,
             body,
-            parseInt(r.headers.get("retry-after"))
+            normalizeInt(r.headers.get("retry-after"))
         )
     }