diff --git a/compiler-rt/lib/msan/msan_interceptors.cpp b/compiler-rt/lib/msan/msan_interceptors.cpp
index 76255cdb742a..f94d3cb79aa0 100644
--- a/compiler-rt/lib/msan/msan_interceptors.cpp
+++ b/compiler-rt/lib/msan/msan_interceptors.cpp
@@ -1127,7 +1127,7 @@ static void SignalAction(int signo, void *si, void *uc) {
   SignalHandlerScope signal_handler_scope;
   ScopedThreadLocalStateBackup stlsb;
   UnpoisonParam(3);
-  __msan_unpoison(si, sizeof(__sanitizer_sigaction));
+  __msan_unpoison(si, sizeof(__sanitizer_siginfo));
   __msan_unpoison(uc, ucontext_t_sz(uc));
 
   typedef void (*sigaction_cb)(int, void *, void *);