diff --git a/Makefile b/Makefile
index 7322466..b2aff0c 100644
--- a/Makefile
+++ b/Makefile
@@ -16,10 +16,10 @@ $(LIB): $(OBJS)
 	$(AR) rvc $(LIB) $?
 
 testyield: testyield.c $(LIB)
-	$(CC) $(CFLAGS) -o $@ testyield.c $(LIB)
+	$(CC) $(CFLAGS) -o $@ testyield.c $(LIB) -lm
 
 testdelay: testdelay.c $(LIB)
-	$(CC) $(CFLAGS) -o $@ testdelay.c $(LIB)
+	$(CC) $(CFLAGS) -o $@ testdelay.c $(LIB) -lm
 
 test: testyield testdelay
 
diff --git a/testdelay.c b/testdelay.c
index d25b491..bd5c6a7 100644
--- a/testdelay.c
+++ b/testdelay.c
@@ -30,7 +30,7 @@ main(int argc, char** argv)
 	(void) argc;
 	(void) argv;
 
-	coio_create(_t1, NULL, 0x8000);
+	coio_create("t1", _t1, NULL, 0x8000);
 
 	if (coio_main() < 0) {
 		printf("Deadlocked\n");
diff --git a/testyield.c b/testyield.c
index ac1b4a2..b1d0cdd 100644
--- a/testyield.c
+++ b/testyield.c
@@ -38,8 +38,8 @@ main(int argc, char** argv)
 	(void) argc;
 	(void) argv;
 
-	coio_create(_t1, NULL, 0x8000);
-	coio_create(_t2, NULL, 0x8000);
+	coio_create("t1", _t1, NULL, 0x8000);
+	coio_create("t2", _t2, NULL, 0x8000);
 
 	if (coio_main() < 0) {
 		printf("Deadlocked\n");