4 files changed, 8 insertions, 8 deletions
diff --git a/src/nvim/eval/encode.c b/src/nvim/eval/encode.c
index d35ac4eb7b..e216dbdaa6 100644
--- a/src/nvim/eval/encode.c
+++ b/src/nvim/eval/encode.c
@@ -855,7 +855,7 @@ char *encode_tv2string(typval_T *tv, size_t *len)
   if (len != NULL) {
     *len = (size_t)ga.ga_len;
   }
-  ga_append(&ga, '\0');
+  ga_append(&ga, NUL);
   return (char *)ga.ga_data;
 }
 
@@ -883,7 +883,7 @@ char *encode_tv2echo(typval_T *tv, size_t *len)
   if (len != NULL) {
     *len = (size_t)ga.ga_len;
   }
-  ga_append(&ga, '\0');
+  ga_append(&ga, NUL);
   return (char *)ga.ga_data;
 }
 
@@ -908,7 +908,7 @@ char *encode_tv2json(typval_T *tv, size_t *len)
   if (len != NULL) {
     *len = (size_t)ga.ga_len;
   }
-  ga_append(&ga, '\0');
+  ga_append(&ga, NUL);
   return (char *)ga.ga_data;
 }
 
diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index e704135366..666d46cdad 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -4318,7 +4318,7 @@ static dict_T *create_environment(const dictitem_T *job_env, const bool clear_en
 
   // Set $NVIM (in the child process) to v:servername. #3118
   char *nvim_addr = get_vim_var_str(VV_SEND_SERVER);
-  if (nvim_addr[0] != '\0') {
+  if (nvim_addr[0] != NUL) {
     dictitem_T *dv = tv_dict_find(env, S_LEN("NVIM"));
     if (dv) {
       tv_dict_item_remove(env, dv);
@@ -9174,13 +9174,13 @@ static void f_termopen(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
   size_t len = home_replace(NULL, NameBuff, IObuff, sizeof(IObuff), true);
   // Trim slash.
   if (len != 1 && (IObuff[len - 1] == '\\' || IObuff[len - 1] == '/')) {
-    IObuff[len - 1] = '\0';
+    IObuff[len - 1] = NUL;
   }
 
   if (len == 1 && IObuff[0] == '/') {
     // Avoid ambiguity in the URI when CWD is root directory.
     IObuff[1] = '.';
-    IObuff[2] = '\0';
+    IObuff[2] = NUL;
   }
 
   // Terminal URI: "term://$CWD//$PID:$CMD"
diff --git a/src/nvim/eval/typval.c b/src/nvim/eval/typval.c
index 1ea1fe46d2..13b31ab30f 100644
--- a/src/nvim/eval/typval.c
+++ b/src/nvim/eval/typval.c
@@ -1824,7 +1824,7 @@ char *callback_to_string(Callback *cb, Arena *arena)
     snprintf(msg, msglen, "<vim partial: %s>", cb->data.partial->pt_name);
     break;
   default:
-    *msg = '\0';
+    *msg = NUL;
     break;
   }
   return msg;
diff --git a/src/nvim/eval/window.c b/src/nvim/eval/window.c
index d7485c12a3..86495f1cb6 100644
--- a/src/nvim/eval/window.c
+++ b/src/nvim/eval/window.c
@@ -272,7 +272,7 @@ static int get_winnr(tabpage_T *tp, typval_T *argvar)
         // if count is not specified, default to 1
         count = 1;
       }
-      if (endp != NULL && *endp != '\0') {
+      if (endp != NULL && *endp != NUL) {
         if (strequal(endp, "j")) {
           twin = win_vert_neighbor(tp, twin, false, count);
         } else if (strequal(endp, "k")) {