diff --git a/source/eventcore/driver.d b/source/eventcore/driver.d
index 16fa91e..a765f2b 100644
--- a/source/eventcore/driver.d
+++ b/source/eventcore/driver.d
@@ -130,8 +130,8 @@ interface EventDriverFiles {
 
 	ulong getSize(FileFD file);
 
-	void write(FileFD file, ulong offset, const(ubyte)[] buffer, FileIOCallback on_write_finish);
-	void read(FileFD file, ulong offset, ubyte[] buffer, FileIOCallback on_read_finish);
+	void write(FileFD file, ulong offset, const(ubyte)[] buffer, IOMode mode, FileIOCallback on_write_finish);
+	void read(FileFD file, ulong offset, ubyte[] buffer, IOMode mode, FileIOCallback on_read_finish);
 	void cancelWrite(FileFD file);
 	void cancelRead(FileFD file);
 
diff --git a/source/eventcore/drivers/libasync.d b/source/eventcore/drivers/libasync.d
index d412934..b11b3de 100644
--- a/source/eventcore/drivers/libasync.d
+++ b/source/eventcore/drivers/libasync.d
@@ -227,12 +227,12 @@ final class LibasyncEventDriverFiles : EventDriverFiles {
 		assert(false, "TODO!");
 	}
 
-	override void write(FileFD file, ulong offset, const(ubyte)[] buffer, FileIOCallback on_write_finish)
+	override void write(FileFD file, ulong offset, const(ubyte)[] buffer, IOMode mode, FileIOCallback on_write_finish)
 	{
 		assert(false, "TODO!");
 	}
 
-	override void read(FileFD file, ulong offset, ubyte[] buffer, FileIOCallback on_read_finish)
+	override void read(FileFD file, ulong offset, ubyte[] buffer, IOMode mode, FileIOCallback on_read_finish)
 	{
 		assert(false, "TODO!");
 	}
diff --git a/source/eventcore/drivers/threadedfile.d b/source/eventcore/drivers/threadedfile.d
index e1b31ed..2fc406f 100644
--- a/source/eventcore/drivers/threadedfile.d
+++ b/source/eventcore/drivers/threadedfile.d
@@ -177,7 +177,7 @@ final class ThreadedFileEventDriver(Events : EventDriverEvents) : EventDriverFil
 		}
 	}
 
-	final override void write(FileFD file, ulong offset, const(ubyte)[] buffer, FileIOCallback on_write_finish)
+	final override void write(FileFD file, ulong offset, const(ubyte)[] buffer, IOMode, FileIOCallback on_write_finish)
 	{
 		//assert(this.writable);
 		auto f = &m_files[file].write;
@@ -205,7 +205,7 @@ log("start task");
 		assert(res, "Cancelling write when no write is in progress.");
 	}
 
-	final override void read(FileFD file, ulong offset, ubyte[] buffer, FileIOCallback on_read_finish)
+	final override void read(FileFD file, ulong offset, ubyte[] buffer, IOMode, FileIOCallback on_read_finish)
 	{
 		auto f = &m_files[file].read;
 		assert(f.callback is null, "Concurrent file reads are not allowed.");
diff --git a/source/eventcore/drivers/winapi.d b/source/eventcore/drivers/winapi.d
index 28e61ff..9fa8d46 100644
--- a/source/eventcore/drivers/winapi.d
+++ b/source/eventcore/drivers/winapi.d
@@ -234,12 +234,12 @@ final class WinAPIEventDriverFiles : EventDriverFiles {
 		assert(false, "TODO!");
 	}
 
-	override void write(FileFD file, ulong offset, const(ubyte)[] buffer, FileIOCallback on_write_finish)
+	override void write(FileFD file, ulong offset, const(ubyte)[] buffer, IOMode mode, FileIOCallback on_write_finish)
 	{
 		assert(false, "TODO!");
 	}
 
-	override void read(FileFD file, ulong offset, ubyte[] buffer, FileIOCallback on_read_finish)
+	override void read(FileFD file, ulong offset, ubyte[] buffer, IOMode mode, FileIOCallback on_read_finish)
 	{
 		assert(false, "TODO!");
 	}