diff --git a/coroutine/copy/Context.h b/coroutine/copy/Context.h
index 1319f55d16..5e5d9e037a 100644
--- a/coroutine/copy/Context.h
+++ b/coroutine/copy/Context.h
@@ -12,7 +12,11 @@
 #include <setjmp.h>
 #include <string.h>
 #include <stdlib.h>
+
+/* OpenBSD supports alloca, but does not include alloca.h */
+#ifndef __OpenBSD__
 #include <alloca.h>
+#endif
 
 #define COROUTINE __attribute__((noreturn)) void