diff --git a/mod.zig b/mod.zig
index 59e100db36f2143cad66209249c8dca0e1b2df1d..42ebcaa0104b6fe6c2ab98b87e4d3098d48acff7 100644
--- a/mod.zig
+++ b/mod.zig
@@ -3614,3 +3614,8 @@ pub fn execvp(file: [*:0]const u8, argv: [*:null]const ?[*:0]const u8) !noreturn
     std.debug.assert(rc == -1);
     return errno.fromInt(errno.fromLibC());
 }
+pub fn dup2(fildes: c_int, fildes2: c_int) !void {
+    const rc = libc.dup2(fildes, fildes2);
+    if (rc == -1) return errno.fromInt(errno.fromLibC());
+    std.debug.assert(rc >= 0);
+}
diff --git a/test.zig b/test.zig
index a8b9a6e12fe185cd8c920d606b59b582ae7f14a3..5f2c7a52c6c6566e67fb525d56ed692b6edd5875 100644
--- a/test.zig
+++ b/test.zig
@@ -75,4 +75,5 @@ test {
     _ = &linux.fork;
     _ = &linux.fchdir;
     _ = &linux.execvp;
+    _ = &linux.dup2;
 }