diff --git a/src/if_ruby.c b/src/if_ruby.c
index 3b5b93b..ab4ac69 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -1238,7 +1238,7 @@
     return Qnil;
 }
 
-static VALUE f_nop(VALUE self)
+static VALUE f_nop(VALUE self UNUSED)
 {
     return Qnil;
 }
diff --git a/src/version.c b/src/version.c
index 7bce146..ea9bc62 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    503,
+/**/
     502,
 /**/
     501,