diff --git a/src/backend/posix.zig b/src/backend/posix.zig
index 36c32f1..202a3a7 100644
--- a/src/backend/posix.zig
+++ b/src/backend/posix.zig
@@ -141,7 +141,12 @@ fn tcflush(fd: std.posix.fd_t, action: TCFLUSH) !void {
                 @intFromEnum(action),
             );
         },
-        .macos => try std.c.tcflush(fd, @intFromEnum(action)),
+        .macos => b: {
+            const c = @cImport({
+                @cInclude("termios.h");
+            });
+            break :b try c.tcflush(fd, @intFromEnum(action));
+        },
         else => @compileError("tcflush unimplemented on this OS"),
     };
     return switch (std.posix.errno(result)) {