diff --git a/Makefile b/Makefile
index 3d1af75..2eb9a50 100644
--- a/Makefile
+++ b/Makefile
@@ -8,14 +8,14 @@ all: $(LIB)
 
 $(OBJS): coio.h coro.h
 
-.o: .c
+.c.o:
 	$(CC) $(CFLAGS) -W -Wall -Wextra -Werror -c $*.c
 
 $(LIB): $(OBJS)
 	$(AR) rvc $(LIB) $?
 
 testyield: testyield.c $(LIB)
-	$(CC) $(CFLAGS) -o $@ $^
+	$(CC) $(CFLAGS) -o $@ testyield.c $(LIB)
 
 test: testyield
 
@@ -25,3 +25,4 @@ clean:
 	rm -f testyield
 
 .PHONY: all clean test
+.SUFFIXES: .c .o
diff --git a/coio.c b/coio.c
index 819dd14..b50bad3 100644
--- a/coio.c
+++ b/coio.c
@@ -6,7 +6,7 @@
 static coro_context _sched_ctx;
 static unsigned long _taskcount = 0;
 
-CoioTaskList coio_ready = {0};
+CoioTaskList coio_ready = {0, 0};
 CoioTask *coio_current;
 
 int
diff --git a/coro.h b/coro.h
index 13cc1aa..9f07c2d 100644
--- a/coro.h
+++ b/coro.h
@@ -303,7 +303,7 @@ void coro_stack_free (struct coro_stack *stack);
 #  define CORO_ASM 1
 # elif defined WINDOWS || defined _WIN32
 #  define CORO_LOSER 1 /* you don't win with windoze */
-# elif __linux && (__i386 || (__x86_64 && !__ILP32))
+# elif (__linux || __OpenBSD__) && (__i386 || (__x86_64 && !__ILP32))
 #  define CORO_ASM 1
 # elif defined HAVE_UCONTEXT_H
 #  define CORO_UCONTEXT 1