diff --git a/runtime/src/libc/syscall.c b/runtime/src/libc/syscall.c
index c389b95..7fca22c 100644
--- a/runtime/src/libc/syscall.c
+++ b/runtime/src/libc/syscall.c
@@ -488,7 +488,7 @@ wasm_writev(int32_t fd, int32_t iov_offset, int32_t iovcnt)
 			int32_t len = iov[i].len;
 			void *  ptr = worker_thread_get_memory_ptr_void(iov[i].base_offset, len);
 
-			printf("%.*s", len, ptr);
+			printf("%.*s", len, (char *)ptr);
 			sum += len;
 		}
 		return sum;