diff --git a/src/memfile_test.c b/src/memfile_test.c
index e9f32b3..672d30f 100644
--- a/src/memfile_test.c
+++ b/src/memfile_test.c
@@ -25,7 +25,7 @@
 #define index_to_key(i) ((i) ^ 15167)
 #define TEST_COUNT 50000
 
-static void test_mf_hash __ARGS((void));
+static void test_mf_hash(void);
 
 /*
  * Test mf_hash_*() functions.