diff --git a/src/alu.c b/src/alu.c
index 2b746ea..ff9f3ff 100644
--- a/src/alu.c
+++ b/src/alu.c
@@ -1042,7 +1042,7 @@ static void int_handle_monadic_operator(struct number *self, enum op_handle op)
 	case OPHANDLE_NOT:
 		self->val.intval = ~(self->val.intval);
 		self->flags &= ~NUMBER_FITS_BYTE;
-		refs = self->addr_refs;	// no change	(FIXME - negate?)
+		refs = -(self->addr_refs);	// negate address ref count
 		break;
 	case OPHANDLE_NEGATE:
 		self->val.intval = -(self->val.intval);
diff --git a/src/version.h b/src/version.h
index 04d93e0..897c790 100644
--- a/src/version.h
+++ b/src/version.h
@@ -9,7 +9,7 @@
 
 #define RELEASE		"0.96.5"	// update before release	FIXME
 #define CODENAME	"Fenchurch"	// update before release
-#define CHANGE_DATE	"10 May"	// update before release	FIXME
+#define CHANGE_DATE	"11 May"	// update before release	FIXME
 #define CHANGE_YEAR	"2020"		// update before release
 //#define HOME_PAGE	"http://home.pages.de/~mac_bacon/smorbrod/acme/"
 #define HOME_PAGE	"http://sourceforge.net/p/acme-crossass/"	// FIXME