diff --git a/tgt-pcb/fp.y b/tgt-pcb/fp.y
index 60be85032..111c5f7ba 100644
--- a/tgt-pcb/fp.y
+++ b/tgt-pcb/fp.y
@@ -1,5 +1,5 @@
 
-%pure-parser
+%define api.pure
 %parse-param {const char*file_path}
 
 %{
diff --git a/vhdlpp/parse.y b/vhdlpp/parse.y
index 6b4c13e5d..ece7a0b70 100644
--- a/vhdlpp/parse.y
+++ b/vhdlpp/parse.y
@@ -1,5 +1,5 @@
 
-%pure-parser
+%define api.pure
 %lex-param { yyscan_t yyscanner }
 %parse-param {yyscan_t yyscanner  }
 %parse-param {const char*file_path}