diff --git a/regressions/Makefile b/regressions/Makefile
index 6a1a769..30eb984 100644
--- a/regressions/Makefile
+++ b/regressions/Makefile
@@ -18,6 +18,7 @@ all:
 	$(MAKE) -C ./ck_stack/validate all
 	$(MAKE) -C ./ck_stack/benchmark all
 	$(MAKE) -C ./ck_ring/validate all
+	$(MAKE) -C ./ck_ring/benchmark all
 	$(MAKE) -C ./ck_rwlock/validate all
 	$(MAKE) -C ./ck_rwlock/benchmark all
 	$(MAKE) -C ./ck_hp/validate all
@@ -41,6 +42,7 @@ clean:
 	$(MAKE) -C ./ck_stack/validate clean
 	$(MAKE) -C ./ck_stack/benchmark clean
 	$(MAKE) -C ./ck_ring/validate clean
+	$(MAKE) -C ./ck_ring/benchmark clean
 	$(MAKE) -C ./ck_rwlock/validate clean
 	$(MAKE) -C ./ck_rwlock/benchmark clean
 	$(MAKE) -C ./ck_hp/validate clean
diff --git a/regressions/ck_ring/benchmark/Makefile b/regressions/ck_ring/benchmark/Makefile
index f14af62..7fb5333 100644
--- a/regressions/ck_ring/benchmark/Makefile
+++ b/regressions/ck_ring/benchmark/Makefile
@@ -11,3 +11,4 @@ clean:
 	rm -rf *~ *.o $(OBJECTS) *.dSYM
 
 include ../../../build/regressions.build
+CFLAGS+=-D_GNU_SOURCE