diff --git a/sys/amd64/ia32/ia32_signal.c b/sys/amd64/ia32/ia32_signal.c
--- a/sys/amd64/ia32/ia32_signal.c
+++ b/sys/amd64/ia32/ia32_signal.c
@@ -339,7 +339,7 @@
 static void
 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
 {
-	struct ia32_sigframe3 sf, *fp;
+	struct ia32_osigframe sf, *fp;
 	struct proc *p;
 	struct thread *td;
 	struct sigacts *psp;
@@ -359,11 +359,11 @@
 	/* Allocate space for the signal handler context. */
 	if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
 	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
-		fp = (struct ia32_sigframe3 *)((uintptr_t)td->td_sigstk.ss_sp +
+		fp = (struct ia32_osigframe *)((uintptr_t)td->td_sigstk.ss_sp +
 		    td->td_sigstk.ss_size - sizeof(sf));
 		td->td_sigstk.ss_flags |= SS_ONSTACK;
 	} else
-		fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
+		fp = (struct ia32_osigframe *)regs->tf_rsp - 1;
 
 	/* Build the argument list for the signal handler. */
 	sf.sf_signum = sig;
@@ -441,7 +441,7 @@
 static void
 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
 {
-	struct ia32_sigframe4 sf, *sfp;
+	struct ia32_freebsd4_sigframe sf, *sfp;
 	struct siginfo32 siginfo;
 	struct proc *p;
 	struct thread *td;
@@ -497,10 +497,10 @@
 	/* Allocate space for the signal handler context. */
 	if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
 	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
-		sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
+		sfp = (struct ia32_freebsd4_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
 		    td->td_sigstk.ss_size - sizeof(sf));
 	} else
-		sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
+		sfp = (struct ia32_freebsd4_sigframe *)regs->tf_rsp - 1;
 	PROC_UNLOCK(p);
 
 	/* Build the argument list for the signal handler. */
@@ -696,7 +696,7 @@
 int
 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
 {
-	struct ia32_sigcontext3 sc, *scp;
+	struct ia32_osigcontext sc, *scp;
 	struct trapframe *regs;
 	int eflags, error;
 	ksiginfo_t ksi;
@@ -754,9 +754,9 @@
 freebsd4_freebsd32_sigreturn(struct thread *td,
     struct freebsd4_freebsd32_sigreturn_args *uap)
 {
-	struct ia32_ucontext4 uc;
+	struct ia32_freebsd4_ucontext uc;
 	struct trapframe *regs;
-	struct ia32_ucontext4 *ucp;
+	struct ia32_freebsd4_ucontext *ucp;
 	int cs, eflags, error;
 	ksiginfo_t ksi;
 
diff --git a/sys/compat/ia32/ia32_genassym.c b/sys/compat/ia32/ia32_genassym.c
--- a/sys/compat/ia32/ia32_genassym.c
+++ b/sys/compat/ia32/ia32_genassym.c
@@ -30,12 +30,12 @@
 ASSYM(IA32_UC_FSBASE, offsetof(struct ia32_ucontext, uc_mcontext.mc_fsbase));
 ASSYM(IA32_UC_GSBASE, offsetof(struct ia32_ucontext, uc_mcontext.mc_gsbase));
 #ifdef COMPAT_43
-ASSYM(IA32_SIGF_SC, offsetof(struct ia32_sigframe3, sf_siginfo.si_sc));
+ASSYM(IA32_SIGF_SC, offsetof(struct ia32_osigframe, sf_siginfo.si_sc));
 #endif
 #ifdef COMPAT_FREEBSD4
-ASSYM(IA32_SIGF_UC4, offsetof(struct ia32_sigframe4, sf_uc));
-ASSYM(IA32_UC4_GS, offsetof(struct ia32_ucontext4, uc_mcontext.mc_gs));
-ASSYM(IA32_UC4_FS, offsetof(struct ia32_ucontext4, uc_mcontext.mc_fs));
-ASSYM(IA32_UC4_ES, offsetof(struct ia32_ucontext4, uc_mcontext.mc_es));
-ASSYM(IA32_UC4_DS, offsetof(struct ia32_ucontext4, uc_mcontext.mc_ds));
+ASSYM(IA32_SIGF_UC4, offsetof(struct ia32_freebsd4_sigframe, sf_uc));
+ASSYM(IA32_UC4_GS, offsetof(struct ia32_freebsd4_ucontext, uc_mcontext.mc_gs));
+ASSYM(IA32_UC4_FS, offsetof(struct ia32_freebsd4_ucontext, uc_mcontext.mc_fs));
+ASSYM(IA32_UC4_ES, offsetof(struct ia32_freebsd4_ucontext, uc_mcontext.mc_es));
+ASSYM(IA32_UC4_DS, offsetof(struct ia32_freebsd4_ucontext, uc_mcontext.mc_ds));
 #endif
diff --git a/sys/compat/ia32/ia32_signal.h b/sys/compat/ia32/ia32_signal.h
--- a/sys/compat/ia32/ia32_signal.h
+++ b/sys/compat/ia32/ia32_signal.h
@@ -89,7 +89,7 @@
 };
 
 #if defined(COMPAT_FREEBSD4)
-struct ia32_mcontext4 {
+struct ia32_freebsd4_mcontext {
 	uint32_t	mc_onstack;		/* XXX - sigcontext compat. */
 	uint32_t	mc_gs;			/* machine state (struct trapframe) */
 	uint32_t	mc_fs;
@@ -114,9 +114,9 @@
 	uint32_t	__spare__[17];
 };
 
-struct ia32_ucontext4 {
+struct ia32_freebsd4_ucontext {
 	sigset_t		uc_sigmask;
-	struct ia32_mcontext4	uc_mcontext;
+	struct ia32_freebsd4_mcontext	uc_mcontext;
 	uint32_t		uc_link;
 	struct sigaltstack32	uc_stack;
 	uint32_t		__spare__[8];
@@ -124,7 +124,7 @@
 #endif
 
 #ifdef COMPAT_43
-struct ia32_sigcontext3 {
+struct ia32_osigcontext {
 	uint32_t	sc_onstack;
 	uint32_t	sc_mask;
 	uint32_t	sc_esp;	
@@ -154,13 +154,13 @@
  */
 
 #ifdef COMPAT_FREEBSD4
-struct ia32_sigframe4 {
+struct ia32_freebsd4_sigframe {
 	uint32_t		sf_signum;
 	uint32_t		sf_siginfo;	/* code or pointer to sf_si */
 	uint32_t		sf_ucontext;	/* points to sf_uc */
 	uint32_t		sf_addr;	/* undocumented 4th arg */
 	uint32_t		sf_ah;		/* action/handler pointer */
-	struct ia32_ucontext4	sf_uc;		/* = *sf_ucontext */
+	struct ia32_freebsd4_ucontext	sf_uc;		/* = *sf_ucontext */
 	struct siginfo32	sf_si;		/* = *sf_siginfo (SA_SIGINFO case) */
 };
 #endif
@@ -177,19 +177,19 @@
 };
 
 #ifdef COMPAT_43
-struct ia32_siginfo3 {
+struct ia32_osiginfo {
 	struct ia32_sigcontext3 si_sc;
 	int			si_signo;
 	int			si_code;
 	union sigval32		si_value;
 };
-struct ia32_sigframe3 {
+struct ia32_osigframe {
 	int			sf_signum;
 	uint32_t		sf_arg2;	/* int or siginfo_t */
 	uint32_t		sf_scp;
 	uint32_t		sf_addr;
 	uint32_t		sf_ah;		/* action/handler pointer */
-	struct ia32_siginfo3	sf_siginfo;
+	struct ia32_osiginfo	sf_siginfo;
 };
 #endif
 
diff --git a/sys/compat/ia32/ia32_sysvec.c b/sys/compat/ia32/ia32_sysvec.c
--- a/sys/compat/ia32/ia32_sysvec.c
+++ b/sys/compat/ia32/ia32_sysvec.c
@@ -78,9 +78,9 @@
 CTASSERT(sizeof(struct ia32_sigframe) == 800);
 CTASSERT(sizeof(struct siginfo32) == 64);
 #ifdef COMPAT_FREEBSD4
-CTASSERT(sizeof(struct ia32_mcontext4) == 260);
-CTASSERT(sizeof(struct ia32_ucontext4) == 324);
-CTASSERT(sizeof(struct ia32_sigframe4) == 408);
+CTASSERT(sizeof(struct ia32_freebsd4_mcontext) == 260);
+CTASSERT(sizeof(struct ia32_freebsd4_ucontext) == 324);
+CTASSERT(sizeof(struct ia32_freebsd4_sigframe) == 408);
 #endif
 
 #include "vdso_ia32_offsets.h"