diff --git a/signal.c b/signal.c
index a4822cf6bc..35ec892f2f 100644
--- a/signal.c
+++ b/signal.c
@@ -403,6 +403,9 @@ interrupt_init(int argc, VALUE *argv, VALUE self)
 }
 
 void rb_malloc_info_show_results(void); /* gc.c */
+#ifdef POSIX_SIGNAL
+static void reset_sigmask(int sig);
+#endif
 
 void
 ruby_default_signal(int sig)
@@ -413,6 +416,9 @@ ruby_default_signal(int sig)
     rb_malloc_info_show_results();
 
     signal(sig, SIG_DFL);
+#ifdef POSIX_SIGNAL
+    reset_sigmask(sig);
+#endif
     raise(sig);
 }