diff --git a/tests/regress/mem_fuzz.c b/tests/regress/mem_fuzz.c
index e54c8a3c..76a7e2d9 100644
--- a/tests/regress/mem_fuzz.c
+++ b/tests/regress/mem_fuzz.c
@@ -55,7 +55,7 @@ void perform_unmap_step(uc_engine *uc){
 
 void perform_write_step(uc_engine *uc){
     char* buff[4096*4];
-    memset(buff, 0, 4096*4);
+    memset((void *)buff, 0, 4096*4);
     uint64_t addr = get_addr();
     uint64_t len = get_len()%(4096*3);
     printf("write(uc,0x%"PRIx64",0x%"PRIx64"); //%d\n", addr, len, step);