diff --git a/packages/qvac-lib-infer-parakeet/parakeet.js b/packages/qvac-lib-infer-parakeet/parakeet.js
index 318ecaf74c..87e8fc87a2 100644
--- a/packages/qvac-lib-infer-parakeet/parakeet.js
+++ b/packages/qvac-lib-infer-parakeet/parakeet.js
@@ -45,6 +45,10 @@ const state = Object.freeze({
   STOPPED: 'stopped'
 })
 
+function nextSafeId (current) {
+  return current >= Number.MAX_SAFE_INTEGER ? 1 : current + 1
+}
+
 function createParakeetError (code, message, cause = undefined) {
   // @qvac/error expects an options object, while the local fallback class
   // accepts positional args. Support both call shapes.
@@ -211,9 +215,8 @@ class ParakeetInterface {
           throw new Error('Cannot set new job: a job is already set or being processed')
         }
 
-        // Only replace the active job after the native runner accepts it.
         this._activeJobId = currentJobId
-        this._nextJobId += 1
+        this._nextJobId = nextSafeId(this._nextJobId)
         this._bufferedAudio = []
         this._setState(state.PROCESSING)
         return currentJobId
@@ -377,7 +380,7 @@ class ParakeetInterface {
         return false
       }
       this._activeJobId = currentJobId
-      this._nextJobId += 1
+      this._nextJobId = nextSafeId(this._nextJobId)
       this._setState(state.PROCESSING)
       return accepted
     } catch (error) {
diff --git a/packages/qvac-lib-infer-whispercpp/whisper.js b/packages/qvac-lib-infer-whispercpp/whisper.js
index 2c26408b73..7a7650a5e0 100644
--- a/packages/qvac-lib-infer-whispercpp/whisper.js
+++ b/packages/qvac-lib-infer-whispercpp/whisper.js
@@ -12,6 +12,10 @@ const state = Object.freeze({
 
 const END_OF_INPUT = 'end of job'
 
+function nextSafeId (current) {
+  return current >= Number.MAX_SAFE_INTEGER ? 1 : current + 1
+}
+
 /**
  * An interface between Bare addon in C++ and JS runtime.
  */
@@ -265,7 +269,7 @@ class WhisperInterface {
         }
 
         this._activeJobId = currentJobId
-        this._nextJobId += 1
+        this._nextJobId = nextSafeId(this._nextJobId)
         this._bufferedAudio = []
         this._setState(state.PROCESSING)
         return currentJobId
@@ -335,7 +339,7 @@ class WhisperInterface {
   async runJob (data) {
     try {
       this._activeJobId = this._nextJobId
-      this._nextJobId += 1
+      this._nextJobId = nextSafeId(this._nextJobId)
       this._setState(state.PROCESSING)
       const accepted = this._binding.runJob(this._handle, {
         ...data,
@@ -360,7 +364,7 @@ class WhisperInterface {
   startStreaming (config = {}) {
     try {
       this._activeJobId = this._nextJobId
-      this._nextJobId += 1
+      this._nextJobId = nextSafeId(this._nextJobId)
       this._setState(state.PROCESSING)
       this._binding.startStreaming(this._handle, config)
     } catch (err) {