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-rw-r--r--macros/scripts/maps.asm2
1 files changed, 2 insertions, 0 deletions
diff --git a/macros/scripts/maps.asm b/macros/scripts/maps.asm
index d9ffd83e..a30e0c06 100644
--- a/macros/scripts/maps.asm
+++ b/macros/scripts/maps.asm
@@ -1,5 +1,7 @@
map_id: MACRO
;\1: map id
+ assert DEF(GROUP_\1) && DEF(MAP_\1), \
+ "Missing 'map_const \1' in constants/map_constants.asm"
db GROUP_\1, MAP_\1
ENDM