diff --git a/src/sfizz/FilePool.cpp b/src/sfizz/FilePool.cpp
index 140beaa0..c474b634 100644
--- a/src/sfizz/FilePool.cpp
+++ b/src/sfizz/FilePool.cpp
@@ -262,7 +262,7 @@ absl::optional<sfz::FileDataHandle> sfz::FilePool::loadFile(const std::string& f
     }
 }
 
-sfz::FilePromisePtr sfz::FilePool::getFilePromise(const std::string& filename)
+sfz::FilePromisePtr sfz::FilePool::getFilePromise(const std::string& filename) noexcept
 {
     if (emptyPromises.empty()) {
         DBG("[sfizz] No empty promises left to honor the one for " << filename);
@@ -286,7 +286,11 @@ sfz::FilePromisePtr sfz::FilePool::getFilePromise(const std::string& filename)
         DBG("[sfizz] Could not enqueue the promise for " << filename << " (queue capacity " << promiseQueue.capacity() << ")");
         return {};
     }
-    workerBarrier.post();
+
+    std::error_code ec;
+    workerBarrier.post(ec);
+    ASSERT(!ec);
+
     emptyPromises.pop_back();
 
     return promise;
@@ -323,7 +327,7 @@ void sfz::FilePool::clearingThread()
     }
 }
 
-void sfz::FilePool::loadingThread()
+void sfz::FilePool::loadingThread() noexcept
 {
     FilePromisePtr promise;
     while (!quitThread) {
@@ -336,7 +340,9 @@ void sfz::FilePool::loadingThread()
             continue;
         }
 
-        workerBarrier.wait();
+        std::error_code ec;
+        workerBarrier.wait(ec);
+        ASSERT(!ec);
 
         if (!promiseQueue.try_pop(promise)) {
             continue;
@@ -444,10 +450,12 @@ uint32_t sfz::FilePool::getPreloadSize() const noexcept
     return preloadSize;
 }
 
-void sfz::FilePool::emptyFileLoadingQueues()
+void sfz::FilePool::emptyFileLoadingQueues() noexcept
 {
     emptyQueue = true;
-    workerBarrier.post();
+    std::error_code ec;
+    workerBarrier.post(ec);
+    ASSERT(!ec);
 
     while (emptyQueue)
         std::this_thread::sleep_for(std::chrono::milliseconds(1));
diff --git a/src/sfizz/FilePool.h b/src/sfizz/FilePool.h
index 6471c75f..c2600ece 100644
--- a/src/sfizz/FilePool.h
+++ b/src/sfizz/FilePool.h
@@ -207,7 +207,7 @@ public:
      * @param filename the file to preload
      * @return FilePromisePtr a file promise
      */
-    FilePromisePtr getFilePromise(const std::string& filename);
+    FilePromisePtr getFilePromise(const std::string& filename) noexcept;
     /**
      * @brief Change the preloading size. This will trigger a full
      * reload of all samples, so don't call it on the audio thread.
@@ -240,7 +240,7 @@ public:
      * method on the audio thread as it will spinlock.
      *
      */
-    void emptyFileLoadingQueues();
+    void emptyFileLoadingQueues() noexcept;
     /**
      * @brief Wait for the background loading to finish for all promises
      * in the queue.
@@ -249,7 +249,7 @@ public:
 private:
     Logger& logger;
     fs::path rootDirectory;
-    void loadingThread();
+    void loadingThread() noexcept;
     void clearingThread();
     void tryToClearPromises();