diff --git a/tests/fuzz/fuzz_client.c b/tests/fuzz/fuzz_client.c
index 7860177..2f439f5 100644
--- a/tests/fuzz/fuzz_client.c
+++ b/tests/fuzz/fuzz_client.c
@@ -78,6 +78,7 @@
 static int dummy_entropy( void *data, unsigned char *output, size_t len )
 {
     size_t i;
+    (void) data;
 
     //use mbedtls_entropy_func to find bugs in it
     //test performance impact of entropy