4 files changed, 7 insertions, 7 deletions
diff --git a/src/os/env.c b/src/os/env.c
index e6cdb92ea8..174f142854 100644
--- a/src/os/env.c
+++ b/src/os/env.c
@@ -42,7 +42,7 @@ char *os_getenvname_at_index(size_t index)
     return NULL;
   }
   int namesize = 0;
-  while (str[namesize] != '=' && str[namesize] != NUL) {
+  while (str[namesize] != '=' && str[namesize] != '\0') {
     namesize++;
   }
   char *name = (char *)vim_strnsave((char_u *)str, namesize);
diff --git a/src/os/fs.c b/src/os/fs.c
index f9b02375e1..461913433f 100644
--- a/src/os/fs.c
+++ b/src/os/fs.c
@@ -84,7 +84,7 @@ static bool is_executable_in_path(const char_u *name)
 {
   const char *path = getenv("PATH");
   // PATH environment variable does not exist or is empty.
-  if (path == NULL || *path == NUL) {
+  if (path == NULL || *path == '\0') {
     return false;
   }
 
diff --git a/src/os/shell.c b/src/os/shell.c
index d14e355d19..7e5f5fd41e 100644
--- a/src/os/shell.c
+++ b/src/os/shell.c
@@ -251,14 +251,14 @@ static int tokenize(char_u *str, char **argv)
   int argc = 0, len;
   char_u *p = str;
 
-  while (*p != NUL) {
+  while (*p != '\0') {
     len = word_length(p);
 
     if (argv != NULL) {
       // Fill the slot
       argv[argc] = xmalloc(len + 1);
       memcpy(argv[argc], p, len);
-      argv[argc][len] = NUL;
+      argv[argc][len] = '\0';
     }
 
     argc++;
@@ -323,7 +323,7 @@ static void write_selection(uv_write_t *req)
         buflen *= 2;
         pdata->wbuffer = xrealloc(pdata->wbuffer, buflen);
       }
-      pdata->wbuffer[off++] = NUL;
+      pdata->wbuffer[off++] = '\0';
     } else {
       char_u  *s = vim_strchr(lp + written, NL);
       len = s == NULL ? l : s - (lp + written);
@@ -405,7 +405,7 @@ static void read_cb(uv_stream_t *stream, ssize_t cnt, const uv_buf_t *buf)
     if (pdata->rbuffer[i] == NL) {
       // Insert the line
       append_ga_line(&pdata->ga);
-    } else if (pdata->rbuffer[i] == NUL) {
+    } else if (pdata->rbuffer[i] == '\0') {
       // Translate NUL to NL
       ga_append(&pdata->ga, NL);
     } else {
diff --git a/src/os/users.c b/src/os/users.c
index e7b362637b..8a52f905be 100644
--- a/src/os/users.c
+++ b/src/os/users.c
@@ -56,7 +56,7 @@ int os_get_uname(uid_t uid, char *s, size_t len)
   struct passwd *pw;
 
   if ((pw = getpwuid(uid)) != NULL
-      && pw->pw_name != NULL && *(pw->pw_name) != NUL) {
+      && pw->pw_name != NULL && *(pw->pw_name) != '\0') {
     vim_strncpy((char_u *)s, (char_u *)pw->pw_name, len - 1);
     return OK;
   }