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-rw-r--r--src/devices/bus/astrocde/slot.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/bus/astrocde/slot.h b/src/devices/bus/astrocde/slot.h
index 738c32a6faa..200f840f0e9 100644
--- a/src/devices/bus/astrocde/slot.h
+++ b/src/devices/bus/astrocde/slot.h
@@ -69,7 +69,7 @@ public:
virtual bool is_creatable() const { return 0; }
virtual bool must_be_loaded() const { return 0; }
virtual bool is_reset_on_load() const { return 1; }
- virtual const option_guide *create_option_guide() const { return NULL; }
+ virtual const option_guide *create_option_guide() const { return nullptr; }
virtual const char *image_interface() const { return "astrocde_cart"; }
virtual const char *file_extensions() const { return "bin"; }