diff --git a/src/common/mythread.h b/src/common/mythread.h
index 7a80f966..1cce50e9 100644
--- a/src/common/mythread.h
+++ b/src/common/mythread.h
@@ -79,7 +79,7 @@ do { \
 } while (0)
 
 
-#if !(defined(_WIN32) && !defined(__CYGWIN__))
+#if !(defined(_WIN32) && !defined(__CYGWIN__)) && !defined(__wasm__)
 // Use sigprocmask() to set the signal mask in single-threaded programs.
 #include <signal.h>