1 files changed, 1 insertions, 1 deletions
diff --git a/tests/prefix_r.l b/tests/prefix_r.l
index a2d4c1a..210a4de 100644
--- a/tests/prefix_r.l
+++ b/tests/prefix_r.l
@@ -71,7 +71,7 @@
 int main(void);
 
 int
-main ()
+main (void)
 {
     yyscan_t  scanner;
     FOOlex_init( &scanner);