diff --git a/src/io/FileDescriptor.cxx b/src/io/FileDescriptor.cxx
index 08c38ca6c..5d326b1a0 100644
--- a/src/io/FileDescriptor.cxx
+++ b/src/io/FileDescriptor.cxx
@@ -267,7 +267,7 @@ void
 FileDescriptor::FullRead(std::span<std::byte> dest) const
 {
 	while (!dest.empty()) {
-		ssize_t nbytes = Read(dest.data(), dest.size());
+		ssize_t nbytes = Read(dest);
 		if (nbytes <= 0) {
 			if (nbytes < 0)
 				throw MakeErrno("Failed to read");
@@ -282,7 +282,7 @@ void
 FileDescriptor::FullWrite(std::span<const std::byte> src) const
 {
 	while (!src.empty()) {
-		ssize_t nbytes = Write(src.data(), src.size());
+		ssize_t nbytes = Write(src);
 		if (nbytes <= 0) {
 			if (nbytes < 0)
 				throw MakeErrno("Failed to write");
diff --git a/src/io/FileDescriptor.hxx b/src/io/FileDescriptor.hxx
index c132a4e9c..458cd8168 100644
--- a/src/io/FileDescriptor.hxx
+++ b/src/io/FileDescriptor.hxx
@@ -246,11 +246,6 @@ public:
 		return ::read(fd, dest.data(), dest.size());
 	}
 
-	[[nodiscard]]
-	ssize_t Read(void *buffer, std::size_t length) const noexcept {
-		return ::read(fd, buffer, length);
-	}
-
 	/**
 	 * Read until all of the given buffer has been filled.  Throws
 	 * on error.
@@ -269,11 +264,6 @@ public:
 		return ::write(fd, src.data(), src.size());
 	}
 
-	[[nodiscard]]
-	ssize_t Write(const void *buffer, std::size_t length) const noexcept {
-		return ::write(fd, buffer, length);
-	}
-
 	/**
 	 * Write until all of the given buffer has been written.
 	 * Throws on error.
diff --git a/src/io/FileOutputStream.cxx b/src/io/FileOutputStream.cxx
index d6df7985b..88386488f 100644
--- a/src/io/FileOutputStream.cxx
+++ b/src/io/FileOutputStream.cxx
@@ -250,7 +250,7 @@ FileOutputStream::Write(std::span<const std::byte> src)
 {
 	assert(IsDefined());
 
-	ssize_t nbytes = fd.Write(src.data(), src.size());
+	ssize_t nbytes = fd.Write(src);
 	if (nbytes < 0)
 		throw FmtErrno("Failed to write to {}", GetPath());
 	else if ((size_t)nbytes < src.size())