diff --git a/test.h b/test.h
index 88d3586..26a2dcd 100644
--- a/test.h
+++ b/test.h
@@ -40,7 +40,7 @@
   do {                                                                     \
     char buf__[BUFSIZ];                                                    \
     ptrdiff_t len__ = snprintf(buf__, BUFSIZ, "%s" fmt "%s\n", clr, KNRM); \
-    write((fd), buf__, len__);                                             \
+    assert(len__ == write((fd), buf__, len__));                            \
   } while (0)
 
 #define suite() pr(STDOUT_FILENO, "Suite: " __FILE__, KCYN)
diff --git a/test/Makefile b/test/Makefile
index 39904f7..fb9abae 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -8,7 +8,7 @@ DELIM = echo "~~"
 ASAN = -fsanitize=address
 UBSAN = -fsanitize=undefined
 TSAN = -fsanitize=thread
-CFLAGS = -std=$(STD) -Wall -Wextra -Wconversion -Wno-sign-conversion -Wdouble-promotion -Wcast-qual -Wvla -Werror -pedantic -O0 -g3 -DNCOLOR=$(NCOLOR) -fpie
+CFLAGS = -std=$(STD) -Wall -Wextra -Wconversion -Wno-sign-conversion -Wdouble-promotion -Wcast-qual -Wvla -Werror -pedantic -g3 -DNCOLOR=$(NCOLOR) -fpie
 LDFLAGS = -Wl,-pie
 
 check: test_arena test_spinlock test_msi
@@ -21,7 +21,7 @@ test_arena: arena
 arena: arena.c .force
 	$(CC) -o $@ $(CFLAGS) $(ASAN) $(UBSAN) $< $(LDFLAGS)
 
-test_spinlock: spinlock_tsan spinlock_asan
+test_spinlock: spinlock_asan
 	@$(DELIM)
 	@echo "[Under TSan]"
 	@./spinlock_tsan