diff --git a/regressions/ck_rwlock/validate/Makefile b/regressions/ck_rwlock/validate/Makefile
index 608416c..2c2116b 100644
--- a/regressions/ck_rwlock/validate/Makefile
+++ b/regressions/ck_rwlock/validate/Makefile
@@ -14,4 +14,4 @@ clean:
 	rm -rf *.dSYM *.exe *~ *.o $(OBJECTS)
 
 include ../../../build/regressions.build
-CFLAGS+=$(PTHREAD_CFLAGS) -D_GNU_SOURCE -O0
+CFLAGS+=$(PTHREAD_CFLAGS) -D_GNU_SOURCE