diff --git a/lib/std/io/file.c3 b/lib/std/io/file.c3
index db110e6b9..a74fc82c1 100644
--- a/lib/std/io/file.c3
+++ b/lib/std/io/file.c3
@@ -76,7 +76,7 @@ fn void! File.memopen(File* file, char[] data, String mode)
  */
 fn void! File.write_byte(&self, char c) @dynamic
 {
-	if (!libc::fputc(c, self.file)) return IoError.EOF?;
+	return os::native_fputc(c, self.file);
 }
 
 /**
diff --git a/lib/std/io/os/file_libc.c3 b/lib/std/io/os/file_libc.c3
index b5cd36273..f156e0054 100644
--- a/lib/std/io/os/file_libc.c3
+++ b/lib/std/io/os/file_libc.c3
@@ -75,6 +75,11 @@ fn usz! native_fwrite(CFile file, char[] buffer) @inline
 	return libc::fwrite(buffer.ptr, 1, buffer.len, file);
 }
 
+fn void! native_fputc(CInt c, CFile stream) @inline
+{
+	if (!libc::fputc(c, stream)) return IoError.EOF?;
+}
+
 fn usz! native_fread(CFile file, char[] buffer) @inline
 {
 	return libc::fread(buffer.ptr, 1, buffer.len, file);
diff --git a/lib/std/io/os/file_nolibc.c3 b/lib/std/io/os/file_nolibc.c3
index c395365d6..b52d80f10 100644
--- a/lib/std/io/os/file_nolibc.c3
+++ b/lib/std/io/os/file_nolibc.c3
@@ -9,6 +9,7 @@ def FtellFn = fn usz!(void*);
 def FwriteFn = fn usz!(void*, char[] buffer);
 def FreadFn = fn usz!(void*, char[] buffer);
 def RemoveFn = fn void!(String);
+def FputcFn = fn void!(int, void*);
 
 FopenFn native_fopen_fn @weak @if(!$defined(native_fopen_fn));
 FcloseFn native_fclose_fn @weak @if(!$defined(native_fclose_fn));
@@ -18,6 +19,7 @@ FtellFn native_ftell_fn @weak @if(!$defined(native_ftell_fn));
 FwriteFn native_fwrite_fn @weak @if(!$defined(native_fwrite_fn));
 FreadFn native_fread_fn @weak @if(!$defined(native_fread_fn));
 RemoveFn native_remove_fn @weak @if(!$defined(native_remove_fn));
+FputcFn native_fputc_fn @weak @if(!$defined(native_fputc_fn));
 
 /**
  * @require mode.len > 0
@@ -73,3 +75,9 @@ fn usz! native_fread(CFile file, char[] buffer) @inline
 	if (native_fread_fn) return native_fread_fn(file, buffer);
 	return IoError.UNSUPPORTED_OPERATION?;
 }
+
+fn void! native_fputc(CInt c, CFile stream) @inline
+{
+	if (native_fputc_fn) return native_fputc_fn(c, stream);
+	return IoError.UNSUPPORTED_OPERATION?;
+}