diff --git a/absl/base/internal/thread_identity.cc b/absl/base/internal/thread_identity.cc
index afa63da5..47a8d41d 100644
--- a/absl/base/internal/thread_identity.cc
+++ b/absl/base/internal/thread_identity.cc
@@ -16,8 +16,12 @@
 
 #if !defined(_WIN32) || defined(__MINGW32__)
 #include <pthread.h>
+#ifndef __wasi__
+// WASI does not provide this header, either way we disable use
+// of signals with it below.
 #include <signal.h>
 #endif
+#endif
 
 #include <atomic>
 #include <cassert>