diff --git a/vlib/net/address.v b/vlib/net/address.v
index d50ed7af13..2f4a5872c1 100644
--- a/vlib/net/address.v
+++ b/vlib/net/address.v
@@ -31,7 +31,7 @@ fn new_addr(addr C.sockaddr) ?Addr {
 	// Convert to string representation
 	buf := []byte{len: net.max_ipv4_addr_len, init: 0}
 	$if windows {
-		res := C.WSAAddressToStringA(&addr, addr_len, C.NULL, buf.data, &buf.len)
+		res := C.WSAAddressToStringA(&addr, addr_len, C.NULL, buf.data, unsafe { &u32(&buf.len) })
 		if res != 0 {
 			socket_error(-1) ?
 		}
diff --git a/vlib/os/os_nix.c.v b/vlib/os/os_nix.c.v
index 492f163d9e..2097301e59 100644
--- a/vlib/os/os_nix.c.v
+++ b/vlib/os/os_nix.c.v
@@ -170,19 +170,20 @@ pub fn execute(cmd string) Result {
 			output: 'exec("$cmd") failed'
 		}
 	}
-	buf := [4096]byte{}
+	buf := unsafe { &char(malloc(4096)) }
 	mut res := strings.new_builder(1024)
 	defer {
 		unsafe { res.free() }
 	}
 	unsafe {
-		bufbp := &buf[0]
-		for C.fgets(&char(bufbp), 4096, f) != 0 {
+		bufbp := buf
+		for C.fgets(bufbp, 4096, f) != 0 {
 			res.write_ptr(bufbp, vstrlen(bufbp))
 		}
 	}
 	soutput := res.str()
 	exit_code := vpclose(f)
+	unsafe { free(buf) }
 	return Result{
 		exit_code: exit_code
 		output: soutput
diff --git a/vlib/v/util/diff.v b/vlib/v/util/diff.v
index b3e2c6f509..54e089dd6b 100644
--- a/vlib/v/util/diff.v
+++ b/vlib/v/util/diff.v
@@ -69,14 +69,14 @@ pub fn color_compare_files(diff_cmd string, file1 string, file2 string) string {
 }
 
 pub fn color_compare_strings(diff_cmd string, unique_prefix string, expected string, found string) string {
-	cdir := os.cache_dir()
+	cdir := os.join_path(os.cache_dir(), unique_prefix)
+	os.mkdir(cdir) or {}
 	ctime := time.sys_mono_now()
-	e_file := os.join_path(cdir, '${unique_prefix}_${ctime}.expected.txt')
-	f_file := os.join_path(cdir, '${unique_prefix}_${ctime}.found.txt')
+	e_file := os.join_path(cdir, '${ctime}.expected.txt')
+	f_file := os.join_path(cdir, '${ctime}.found.txt')
 	os.write_file(e_file, expected) or { panic(err) }
 	os.write_file(f_file, found) or { panic(err) }
 	res := color_compare_files(diff_cmd, e_file, f_file)
-	os.rm(e_file) or { panic(err) }
-	os.rm(f_file) or { panic(err) }
+	os.rmdir_all(cdir) or {}
 	return res
 }