diff --git a/sys/compat/ia32/ia32_genassym.c b/sys/compat/ia32/ia32_genassym.c
index ef49c3aadae4..54cec2189ef4 100644
--- a/sys/compat/ia32/ia32_genassym.c
+++ b/sys/compat/ia32/ia32_genassym.c
@@ -17,7 +17,7 @@ ASSYM(IA32_UC_FS, offsetof(struct ia32_ucontext, uc_mcontext.mc_fs));
 ASSYM(IA32_UC_ES, offsetof(struct ia32_ucontext, uc_mcontext.mc_es));
 ASSYM(IA32_UC_DS, offsetof(struct ia32_ucontext, uc_mcontext.mc_ds));
 #ifdef COMPAT_FREEBSD4
-ASSYM(IA32_SIGF_UC4, offsetof(struct ia32_sigframe, sf_uc));
+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));