diff --git a/src/zscript/zcc_parser.h b/src/zscript/zcc_parser.h
index eaaba6192..8d3f9bab9 100644
--- a/src/zscript/zcc_parser.h
+++ b/src/zscript/zcc_parser.h
@@ -2,6 +2,7 @@ struct ZCCParseState
 {
 	ZCCParseState(FScanner &scanner) : sc(scanner)
 	{
+		TopNode = NULL;
 	}
 
 	FScanner ≻