diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index 79b500b63d..0dfe7a2500 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -80,11 +80,11 @@ pub extern "c" fn posix_memalign(memptr: *?*anyopaque, alignment: usize, size: u
 pub const posix_spawnattr_t = *opaque {};
 pub const posix_spawn_file_actions_t = *opaque {};
 pub extern "c" fn posix_spawnattr_init(attr: *posix_spawnattr_t) c_int;
-pub extern "c" fn posix_spawnattr_destroy(attr: *posix_spawnattr_t) void;
+pub extern "c" fn posix_spawnattr_destroy(attr: *posix_spawnattr_t) c_int;
 pub extern "c" fn posix_spawnattr_setflags(attr: *posix_spawnattr_t, flags: c_short) c_int;
 pub extern "c" fn posix_spawnattr_getflags(attr: *const posix_spawnattr_t, flags: *c_short) c_int;
 pub extern "c" fn posix_spawn_file_actions_init(actions: *posix_spawn_file_actions_t) c_int;
-pub extern "c" fn posix_spawn_file_actions_destroy(actions: *posix_spawn_file_actions_t) void;
+pub extern "c" fn posix_spawn_file_actions_destroy(actions: *posix_spawn_file_actions_t) c_int;
 pub extern "c" fn posix_spawn_file_actions_addclose(actions: *posix_spawn_file_actions_t, filedes: fd_t) c_int;
 pub extern "c" fn posix_spawn_file_actions_addopen(
     actions: *posix_spawn_file_actions_t,
diff --git a/lib/std/os/posix_spawn.zig b/lib/std/os/posix_spawn.zig
index d36475df7f..32904a9423 100644
--- a/lib/std/os/posix_spawn.zig
+++ b/lib/std/os/posix_spawn.zig
@@ -47,8 +47,12 @@ const posix_spawn = if (builtin.target.isDarwin()) struct {
         }
 
         pub fn deinit(self: *Attr) void {
-            system.posix_spawnattr_destroy(&self.attr);
-            self.* = undefined;
+            defer self.* = undefined;
+            switch (errno(system.posix_spawnattr_destroy(&self.attr))) {
+                .SUCCESS => return,
+                .INVAL => unreachable, // Invalid parameters.
+                else => unreachable,
+            }
         }
 
         pub fn get(self: Attr) Error!u16 {
@@ -83,8 +87,12 @@ const posix_spawn = if (builtin.target.isDarwin()) struct {
         }
 
         pub fn deinit(self: *Actions) void {
-            system.posix_spawn_file_actions_destroy(&self.actions);
-            self.* = undefined;
+            defer self.* = undefined;
+            switch (errno(system.posix_spawn_file_actions_destroy(&self.actions))) {
+                .SUCCESS => return,
+                .INVAL => unreachable, // Invalid parameters.
+                else => unreachable,
+            }
         }
 
         pub fn open(self: *Actions, fd: fd_t, path: []const u8, flags: u32, mode: mode_t) Error!void {