diff --git a/src/sfizz/FilePool.cpp b/src/sfizz/FilePool.cpp
index e0bd5a5a..d711e9c5 100644
--- a/src/sfizz/FilePool.cpp
+++ b/src/sfizz/FilePool.cpp
@@ -108,7 +108,7 @@ absl::optional<sfz::FilePool::FileInformation> sfz::FilePool::getFileInformation
     if (!fs::exists(file))
         return {};
 
-    SndfileHandle sndFile(file.c_str());
+    SndfileHandle sndFile(file.string().c_str());
     if (sndFile.channels() != 1 && sndFile.channels() != 2) {
         DBG("Missing logic for " << sndFile.channels() << " channels, discarding sample " << filename);
         return {};
@@ -135,7 +135,7 @@ bool sfz::FilePool::preloadFile(const std::string& filename, uint32_t maxOffset)
     if (!fs::exists(file))
         return false;
 
-    SndfileHandle sndFile(file.c_str());
+    SndfileHandle sndFile(file.string().c_str());
     if (sndFile.channels() != 1 && sndFile.channels() != 2)
         return false;
 
@@ -198,7 +198,7 @@ void sfz::FilePool::setPreloadSize(uint32_t preloadSize) noexcept
         const auto numFrames = preloadedFile.second.preloadedData->getNumFrames() / static_cast<int>(oversamplingFactor);
         const uint32_t maxOffset = numFrames > this->preloadSize ? numFrames - this->preloadSize : 0;
         fs::path file { rootDirectory / std::string(preloadedFile.first) };
-        SndfileHandle sndFile(file.c_str());
+        SndfileHandle sndFile(file.string().c_str());
         preloadedFile.second.preloadedData = readFromFile<float>(sndFile, preloadSize + maxOffset, oversamplingFactor);
     }
     this->preloadSize = preloadSize;
@@ -248,7 +248,7 @@ void sfz::FilePool::loadingThread() noexcept
         [[maybe_unused]] const auto waitDurationMillis = std::chrono::duration<double,std::milli>(waitDuration).count();
 
         fs::path file { rootDirectory / std::string(promise->filename) };
-        SndfileHandle sndFile(file.c_str());
+        SndfileHandle sndFile(file.string().c_str());
         if (sndFile.error() != 0) {
             DBG("[sfizz] libsndfile errored for " << promise->filename << " with message " << sndFile.strError());
             continue;
@@ -328,7 +328,7 @@ void sfz::FilePool::setOversamplingFactor(sfz::Oversampling factor) noexcept
         const auto numFrames = preloadedFile.second.preloadedData->getNumFrames() / static_cast<int>(this->oversamplingFactor);
         const uint32_t maxOffset = numFrames > this->preloadSize ? numFrames - this->preloadSize : 0;
         fs::path file { rootDirectory / std::string(preloadedFile.first) };
-        SndfileHandle sndFile(file.c_str());
+        SndfileHandle sndFile(file.string().c_str());
         preloadedFile.second.preloadedData = readFromFile<float>(sndFile, preloadSize + maxOffset, factor);
         preloadedFile.second.sampleRate *= samplerateChange;
     }