diff --git a/Makefile b/Makefile
index 554ebb9..b828751 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,20 @@ LUA_APIS = 5.1 5.2 5.3
 include $(top_srcdir)/lua/Rules.mk
 include $(top_srcdir)/bench/Rules.mk
 
-all: test-timeout
+all: check-timeout-cb test-timeout
+
+check-timeout-cb:
+	@echo $(CFLAGS) $(CPPFLAGS) | grep "\-DTIMEOUT_CB_OVERRIDE" > /dev/null  \
+	&& NEED_OVERRIDE=1 || NEED_OVERRIDE=0;\
+	if [[ "$${NEED_OVERRIDE}" -eq "1" ]];then \
+	TEMPOUT=`mktemp /tmp/timeout-out.XXXXXX`; \
+	TEMPCHK=`mktemp /tmp/timeout-chk.XXXXXX`; \
+	printf "#include \"timeout_cb.h\"\nint main(){struct timeout_cb cb;return 0;}" > $${TEMPCHK}.c; \
+	$(CC) -o $${TEMPOUT} $${TEMPCHK}.c $(ALL_CPPFLAGS) 2> /dev/null && HAS_TIMEOUT_CB=1 || HAS_TIMEOUT_CB=0; \
+	$(RM) /tmp/timeout-out.* /tmp/timeout-chk.*; \
+	if [[ "$${HAS_TIMEOUT_CB}" -eq "0" ]];then echo "Error: Can not find 'timeout_cb.h' or have not defined \
+	struct timeout_cb. If you have defined the macro TIMEOUT_CB_OVERRIDE, please create 'timeout_cb.h' and \
+	define your own struct timeout_cb in it." && exit 1; fi fi
 
 timeout.o: $(top_srcdir)/timeout.c
 test-timeout.o: $(top_srcdir)/test-timeout.c
diff --git a/timeout.h b/timeout.h
index 3ef76e9..0c78a76 100644
--- a/timeout.h
+++ b/timeout.h
@@ -90,9 +90,11 @@ typedef uint64_t timeout_t;
 
 #ifndef TIMEOUT_CB_OVERRIDE
 struct timeout_cb {
-	void (*fn)();
+	void (*fn)(void);
 	void *arg;
 }; /* struct timeout_cb */
+#else
+#include "timeout_cb.h"
 #endif
 
 /*
diff --git a/timeout_cb.h b/timeout_cb.h
new file mode 100644
index 0000000..0ea00c2
--- /dev/null
+++ b/timeout_cb.h
@@ -0,0 +1,5 @@
+/* Customize your own timeout callback here */
+struct timeout_cb {
+    void (*fn)(void);
+	void *arg;
+};