diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp
index 2d1bb1a12da6e4..fa7ec5fab9d4d5 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp
@@ -100,6 +100,7 @@ namespace __sanitizer {
   unsigned struct_group_sz = sizeof(struct group);
   unsigned siginfo_t_sz = sizeof(siginfo_t);
   unsigned struct_sigaction_sz = sizeof(struct sigaction);
+  unsigned struct_stack_t_sz = sizeof(stack_t);
   unsigned struct_itimerval_sz = sizeof(struct itimerval);
   unsigned pthread_t_sz = sizeof(pthread_t);
   unsigned pthread_mutex_t_sz = sizeof(pthread_mutex_t);
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h
index 71cf5b9c35715c..45f894c25658c8 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h
@@ -53,6 +53,7 @@ extern unsigned struct_timezone_sz;
 extern unsigned struct_tms_sz;
 extern unsigned struct_itimerspec_sz;
 extern unsigned struct_sigevent_sz;
+extern unsigned struct_stack_t_sz;
 extern unsigned struct_sched_param_sz;
 extern unsigned struct_statfs64_sz;
 extern unsigned struct_statfs_sz;