diff --git a/lib/std/os/linux/aarch64.zig b/lib/std/os/linux/aarch64.zig
index 649e474310fcc50e896f13edf12e515bbbf58ad0..ed40145e1bbb9cfd7daa637c3df6237544823a56 100644
--- a/lib/std/os/linux/aarch64.zig
+++ b/lib/std/os/linux/aarch64.zig
@@ -289,7 +289,7 @@ pub const ucontext_t = extern struct {
     flags: usize,
     link: ?*ucontext_t,
     stack: stack_t,
-    sigmask: sigset_t,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
     mcontext: mcontext_t,
 };
 
diff --git a/lib/std/os/linux/arm.zig b/lib/std/os/linux/arm.zig
index 8f83bb60a1bacc8177ec049e6cbaff93baaf89ca..8fea30a5da8bceea846c33c25e73351ecbb24270 100644
--- a/lib/std/os/linux/arm.zig
+++ b/lib/std/os/linux/arm.zig
@@ -337,7 +337,7 @@ pub const ucontext_t = extern struct {
     link: ?*ucontext_t,
     stack: stack_t,
     mcontext: mcontext_t,
-    sigmask: sigset_t,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
     regspace: [64]u64,
 };
 
diff --git a/lib/std/os/linux/loongarch64.zig b/lib/std/os/linux/loongarch64.zig
index 9ee8fe229c2a80f709dea234f5b36b6fd6b78756..50c4664ac821dd4bbb07433c5a96e23aede4a38c 100644
--- a/lib/std/os/linux/loongarch64.zig
+++ b/lib/std/os/linux/loongarch64.zig
@@ -264,8 +264,7 @@ pub const ucontext_t = extern struct {
     flags: c_ulong,
     link: ?*ucontext_t,
     stack: stack_t,
-    sigmask: sigset_t,
-    _pad: [1024 / 8 - @sizeOf(sigset_t)]u8,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
     mcontext: mcontext_t,
 };
 
diff --git a/lib/std/os/linux/powerpc.zig b/lib/std/os/linux/powerpc.zig
index 443a32769ab59b39942378f938720b1c087d6272..450cb27c7ec47a06bf99454fe3154eb0ec9a83e7 100644
--- a/lib/std/os/linux/powerpc.zig
+++ b/lib/std/os/linux/powerpc.zig
@@ -341,7 +341,7 @@ pub const ucontext_t = extern struct {
     stack: stack_t,
     pad: [7]i32,
     regs: *mcontext_t,
-    sigmask: sigset_t,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
     pad2: [3]i32,
     mcontext: mcontext_t,
 };
diff --git a/lib/std/os/linux/powerpc64.zig b/lib/std/os/linux/powerpc64.zig
index bb1032fb21ad526f22667f9873dcfc8db1ac87fc..b0a14ff3cb6e85f0b8bbe87bc29762aa50eb4211 100644
--- a/lib/std/os/linux/powerpc64.zig
+++ b/lib/std/os/linux/powerpc64.zig
@@ -337,7 +337,7 @@ pub const ucontext_t = extern struct {
     flags: u32,
     link: ?*ucontext_t,
     stack: stack_t,
-    sigmask: sigset_t,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
     mcontext: mcontext_t,
 };
 
diff --git a/lib/std/os/linux/s390x.zig b/lib/std/os/linux/s390x.zig
index 70cf53f6fd085b0d422ffe28452997f12f56cacf..614c33d076f5047d96756be873efed23578d6565 100644
--- a/lib/std/os/linux/s390x.zig
+++ b/lib/std/os/linux/s390x.zig
@@ -273,7 +273,7 @@ pub const ucontext_t = extern struct {
     link: ?*ucontext_t,
     stack: stack_t,
     mcontext: mcontext_t,
-    sigmask: sigset_t,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
 };
 
 pub const mcontext_t = extern struct {
diff --git a/lib/std/os/linux/sparc64.zig b/lib/std/os/linux/sparc64.zig
index 594b11b7acccbd363e730111a5883fe3faeb47f1..34df73fcb1607d10ae11c4d7b117d681b935d694 100644
--- a/lib/std/os/linux/sparc64.zig
+++ b/lib/std/os/linux/sparc64.zig
@@ -454,7 +454,7 @@ pub const ucontext_t = extern struct {
     sigmask: u64,
     mcontext: mcontext_t,
     stack: stack_t,
-    sigset: sigset_t,
+    sigset: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
 };
 
 /// TODO
diff --git a/lib/std/os/linux/x86.zig b/lib/std/os/linux/x86.zig
index cef038820616799bbb5dde7083c6530cfcf0fc83..41e1ec7d997da67aef12d5a14c555ecf82940cb6 100644
--- a/lib/std/os/linux/x86.zig
+++ b/lib/std/os/linux/x86.zig
@@ -350,7 +350,7 @@ pub const ucontext_t = extern struct {
     link: ?*ucontext_t,
     stack: stack_t,
     mcontext: mcontext_t,
-    sigmask: sigset_t,
+    sigmask: [1024 / @bitSizeOf(c_ulong)]c_ulong, // Currently a libc-compatible (1024-bit) sigmask
     regspace: [64]u64,
 };