diff --git a/src/common/io/io.h b/src/common/io/io.h
index f727af67d..908169985 100644
--- a/src/common/io/io.h
+++ b/src/common/io/io.h
@@ -66,7 +66,7 @@ static inline ssize_t ffReadFDData(FFNativeFD fd, size_t dataSize, void* data)
 }
 
 ssize_t ffReadFileData(const char* fileName, size_t dataSize, void* data);
-ssize_t ffReadFileDataRelative(int dfd, const char* fileName, size_t dataSize, void* data);
+ssize_t ffReadFileDataRelative(FFNativeFD dfd, const char* fileName, size_t dataSize, void* data);
 
 bool ffAppendFDBuffer(FFNativeFD fd, FFstrbuf* buffer);
 bool ffAppendFileBuffer(const char* fileName, FFstrbuf* buffer);
diff --git a/src/common/io/io_windows.c b/src/common/io/io_windows.c
index bc3b1cfb6..9f1a96ce5 100644
--- a/src/common/io/io_windows.c
+++ b/src/common/io/io_windows.c
@@ -129,16 +129,16 @@ HANDLE openat(HANDLE dfd, const char* fileName, bool directory)
 
 bool ffAppendFileBufferRelative(HANDLE dfd, const char* fileName, FFstrbuf* buffer)
 {
-    HANDLE FF_AUTO_CLOSE_FD fd = openat(dfd, fileName, O_RDONLY | O_CLOEXEC);
+    HANDLE FF_AUTO_CLOSE_FD fd = openat(dfd, fileName, false);
     if(fd == INVALID_HANDLE_VALUE)
         return false;
 
     return ffAppendFDBuffer(fd, buffer);
 }
 
-ssize_t ffReadFileDataRelative(int dfd, const char* fileName, size_t dataSize, void* data)
+ssize_t ffReadFileDataRelative(HANDLE dfd, const char* fileName, size_t dataSize, void* data)
 {
-    HANDLE FF_AUTO_CLOSE_FD fd = openat(dfd, fileName, O_RDONLY | O_CLOEXEC);
+    HANDLE FF_AUTO_CLOSE_FD fd = openat(dfd, fileName, false);
     if(fd == INVALID_HANDLE_VALUE)
         return -1;