diff --git a/src/FilePtr.cpp b/src/FilePtr.cpp
index 45e65d46..f0e0844c 100644
--- a/src/FilePtr.cpp
+++ b/src/FilePtr.cpp
@@ -9,10 +9,10 @@ namespace aare {
 
 FilePtr::FilePtr(const std::filesystem::path &fname,
                  const std::string &mode = "rb") {
-    fp_ = fopen(fname.c_str(), mode.c_str());
+    fp_ = fopen(fname.string().c_str(), mode.c_str());
     if (!fp_)
         throw std::runtime_error(
-            fmt::format("Could not open: {}", fname.c_str()));
+            fmt::format("Could not open: {}", fname.string()));
 }
 
 FilePtr::FilePtr(FilePtr &&other) { std::swap(fp_, other.fp_); }
diff --git a/src/JungfrauDataFile.cpp b/src/JungfrauDataFile.cpp
index 34820b8b..5c19cbc3 100644
--- a/src/JungfrauDataFile.cpp
+++ b/src/JungfrauDataFile.cpp
@@ -136,7 +136,7 @@ void JungfrauDataFile::find_frame_size(const std::filesystem::path &fname) {
 
 void JungfrauDataFile::parse_fname(const std::filesystem::path &fname) {
     m_path = fname.parent_path();
-    m_base_name = fname.stem();
+    m_base_name = fname.stem().string();
 
     // find file index, then remove if from the base name
     if (auto pos = m_base_name.find_last_of('_'); pos != std::string::npos) {
diff --git a/src/NumpyFile.cpp b/src/NumpyFile.cpp
index 699fa08c..d70ae5bb 100644
--- a/src/NumpyFile.cpp
+++ b/src/NumpyFile.cpp
@@ -28,8 +28,7 @@ NumpyFile::NumpyFile(const std::filesystem::path &fname,
             throw std::runtime_error(
                 fmt::format("Could not open: {} for reading", fname.string()));
         }
-        initial_header_len = aare::NumpyHelpers::write_header(
-            std::filesystem::path(fname.c_str()), m_header);
+        initial_header_len = aare::NumpyHelpers::write_header(fname, m_header);
     }
     m_pixels_per_frame =
         std::accumulate(m_header.shape.begin() + 1, m_header.shape.end(), 1,
diff --git a/src/RawMasterFile.cpp b/src/RawMasterFile.cpp
index e0880ba5..4259c899 100644
--- a/src/RawMasterFile.cpp
+++ b/src/RawMasterFile.cpp
@@ -11,8 +11,8 @@ namespace aare {
 RawFileNameComponents::RawFileNameComponents(
     const std::filesystem::path &fname) {
     m_base_path = fname.parent_path();
-    m_base_name = fname.stem();
-    m_ext = fname.extension();
+    m_base_name = fname.stem().string();
+    m_ext = fname.extension().string();
 
     if (m_ext != ".json" && m_ext != ".raw") {
         throw std::runtime_error(LOCATION +
diff --git a/src/RawSubFile.cpp b/src/RawSubFile.cpp
index 7a42bbba..cd1a6fba 100644
--- a/src/RawSubFile.cpp
+++ b/src/RawSubFile.cpp
@@ -163,7 +163,7 @@ void RawSubFile::parse_fname(const std::filesystem::path &fname) {
     // f1 is the file index - thi is the one we need
     // 0 is the measurement index, will not change
     m_path = fname.parent_path();
-    m_base_name = fname.filename();
+    m_base_name = fname.filename().string();
 
     // Regex to extract numbers after 'd' and 'f'
     std::regex pattern(R"(^(.*_d)(\d+)(_f)(\d+)(_\d+\.raw)$)");