diff --git a/lib/src/subtree.h b/lib/src/subtree.h
index 4a02b8fe..8456d2f1 100644
--- a/lib/src/subtree.h
+++ b/lib/src/subtree.h
@@ -114,7 +114,7 @@ typedef struct {
   Length size;
   uint32_t lookahead_bytes;
   uint32_t error_cost;
-  uint16_t child_count;
+  uint32_t child_count;
   TSSymbol symbol;
   TSStateId parse_state;