diff --git a/compel/arch/x86/src/lib/include/uapi/asm/sigframe.h b/compel/arch/x86/src/lib/include/uapi/asm/sigframe.h
index e9357002c..a939bbee1 100644
--- a/compel/arch/x86/src/lib/include/uapi/asm/sigframe.h
+++ b/compel/arch/x86/src/lib/include/uapi/asm/sigframe.h
@@ -99,7 +99,7 @@ struct ucontext_ia32 {
 	compat_stack_t		uc_stack;
 	struct rt_sigcontext_32	uc_mcontext;
 	k_rtsigset_t		uc_sigmask; /* mask last for extensibility */
-};
+} __packed;
 
 struct rt_sigframe_ia32 {
 	uint32_t		pretcode;