diff --git a/Makefile b/Makefile
index 42824ead..4595608e 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ build-main:
 build-lib:
 	cd src; \
 	  yacc -d parse.y; \
-	  lex scan.l
+	  flex scan.l
 	$(CC) $(CFLAGS) -shared src/*.c -o lib/$(PICRIN_LIB) -I./include -I./extlib -lm
 
 clean:
diff --git a/src/parse.y b/src/parse.y
index 43e1b117..b14f5626 100644
--- a/src/parse.y
+++ b/src/parse.y
@@ -136,7 +136,7 @@ yy_blob_new(struct parser_control *p, char *dat, int len)
 void yyerror(struct parser_control *, const char *);
 %}
 
-%pure_parser
+%pure-parser
 %parse-param {struct parser_control *p}
 %lex-param {struct parser_control *p}