diff --git a/src/common/jsonapi.c b/src/common/jsonapi.c
index 45838d8a184..ca4ecd571ef 100644
--- a/src/common/jsonapi.c
+++ b/src/common/jsonapi.c
@@ -1536,7 +1536,7 @@ json_lex(JsonLexContext *lex)
 		jsonapi_StrValType *ptok = &(lex->inc_state->partial_token);
 		size_t		added = 0;
 		bool		tok_done = false;
-		JsonLexContext dummy_lex;
+		JsonLexContext dummy_lex = {0};
 		JsonParseErrorType partial_result;
 
 		if (ptok->data[0] == '"')