diff --git a/compat/mingw.c b/compat/mingw.c
index b673625..dae30a0 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1677,14 +1677,16 @@
 #undef signal
 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
 {
-	sig_handler_t old = timer_fn;
+	sig_handler_t old;
 
 	switch (sig) {
 	case SIGALRM:
+		old = timer_fn;
 		timer_fn = handler;
 		break;
 
 	case SIGINT:
+		old = sigint_fn;
 		sigint_fn = handler;
 		break;