diff --git a/configure.ac b/configure.ac
index bba8f61b0e..27e7f86ab9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2281,6 +2281,9 @@ AS_CASE(["$rb_cv_fiber_coroutine"], [yes|''], [
         [powerpc64le-linux], [
             rb_cv_fiber_coroutine=ppc64le
         ],
+        [x86_64-openbsd*], [
+            rb_cv_fiber_coroutine=amd64
+        ],
         [*-openbsd*], [
             rb_cv_fiber_coroutine=
         ],
diff --git a/cont.c b/cont.c
index 4622f948ff..9b28ed1484 100644
--- a/cont.c
+++ b/cont.c
@@ -85,7 +85,6 @@
 #ifndef _WIN32
 #include <unistd.h>
 #include <sys/mman.h>
-#include <ucontext.h>
 #endif
 #define RB_PAGE_SIZE (pagesize)
 #define RB_PAGE_MASK (~(RB_PAGE_SIZE - 1))