diff --git a/parser.c b/parser.c
index 0ec8e97..d374549 100644
--- a/parser.c
+++ b/parser.c
@@ -49,9 +49,9 @@ static void yyerror(const char *fmt, ...)
 
 	va_start(ap, fmt);
 
-	printf("parse error on line %u:\n\t", yyline);
-	vprintf(fmt, ap);
-	printf("\n");
+	fprintf(stderr, "parse error on line %u:\n\t", yyline);
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, "\n");
 
 	va_end(ap);