diff --git a/lib/std/c/dragonfly.zig b/lib/std/c/dragonfly.zig
index 4070ec9ea8..9e4f27bf04 100644
--- a/lib/std/c/dragonfly.zig
+++ b/lib/std/c/dragonfly.zig
@@ -557,6 +557,13 @@ pub const NOTE_FFCTRLMASK = 3221225472;
 pub const NOTE_FFCOPY = 3221225472;
 pub const NOTE_PCTRLMASK = 4026531840;
 
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
+};
+
 pub const stack_t = extern struct {
     sp: [*]u8,
     size: isize,
diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index 561b940a81..94854cf090 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -1153,6 +1153,13 @@ pub const T = struct {
     pub const IOCSIG = 0x2004745f;
 };
 
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
+};
+
 pub const winsize = extern struct {
     ws_row: u16,
     ws_col: u16,
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index 3d78230290..5961b3f490 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -806,12 +806,11 @@ pub const T = struct {
     pub const IOCXMTFRAME = 0x80087444;
 };
 
-// Commands passed to tcsetattr() for setting the termios structure.
-pub const TCSA = struct {
-    pub const NOW = 0; // make change immediate
-    pub const DRAIN = 1; // drain output, then chage
-    pub const FLUSH = 2; // drain output, flush input
-    pub const SOFT = 0x10; // flag - don't alter h.w. state
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
 };
 
 pub const TCIFLUSH = 1;
diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 21f025f8f0..4b02517bef 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -768,12 +768,11 @@ pub const AUTH = struct {
     pub const ALLOW: c_int = (OKAY | ROOTOKAY | SECURE);
 };
 
-// Commands passed to tcsetattr() for setting the termios structure.
-pub const TCSA = struct {
-    pub const NOW = 0; // make change immediate
-    pub const DRAIN = 1; // drain output, then change
-    pub const FLUSH = 2; // drain output, flush input
-    pub const SOFT = 0x10; // flag - don't alter h.w. state
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
 };
 
 pub const TCIFLUSH = 1;