diff --git a/src/libpostal_config.h b/src/libpostal_config.h
index 8ae25ef3..6b07a9b8 100644
--- a/src/libpostal_config.h
+++ b/src/libpostal_config.h
@@ -16,6 +16,7 @@
 #define LIBPOSTAL_DICTIONARIES_DIR LIBPOSTAL_DATA_DIR PATH_SEPARATOR "dictionaries"
 #define LIBPOSTAL_GEONAMES_DIR LIBPOSTAL_DATA_DIR PATH_SEPARATOR "geonames"
 #define LIBPOSTAL_GEODB_DIR LIBPOSTAL_DATA_DIR PATH_SEPARATOR "geodb"
+#define LIBPOSTAL_LANGUAGE_CLASSIFIER_DIR LIBPOSTAL_DATA_DIR PATH_SEPARATOR "language_classifier"
 #define LIBPOSTAL_TRANSLITERATION_DIR LIBPOSTAL_DATA_DIR PATH_SEPARATOR "transliteration"
 
 #define GEODB_BLOOM_FILTER_SIZE 100000000