4 files changed, 8 insertions, 8 deletions
diff --git a/src/core/lib/support/env_posix.cc b/src/core/lib/support/env_posix.cc
index 7bea31ca55..8146330555 100644
--- a/src/core/lib/support/env_posix.cc
+++ b/src/core/lib/support/env_posix.cc
@@ -31,12 +31,12 @@
 
 const char* gpr_getenv_silent(const char* name, char** dst) {
   *dst = gpr_getenv(name);
-  return NULL;
+  return nullptr;
 }
 
 char* gpr_getenv(const char* name) {
   char* result = getenv(name);
-  return result == NULL ? result : gpr_strdup(result);
+  return result == nullptr ? result : gpr_strdup(result);
 }
 
 void gpr_setenv(const char* name, const char* value) {
diff --git a/src/core/lib/support/fork.cc b/src/core/lib/support/fork.cc
index d59ca5584c..dc291c4080 100644
--- a/src/core/lib/support/fork.cc
+++ b/src/core/lib/support/fork.cc
@@ -39,7 +39,7 @@ void grpc_fork_support_init() {
 #else
   fork_support_enabled = 0;
   char* env = gpr_getenv("GRPC_ENABLE_FORK_SUPPORT");
-  if (env != NULL) {
+  if (env != nullptr) {
     static const char* truthy[] = {"yes",  "Yes",  "YES", "true",
                                    "True", "TRUE", "1"};
     for (size_t i = 0; i < GPR_ARRAY_SIZE(truthy); i++) {
diff --git a/src/core/lib/support/log_posix.cc b/src/core/lib/support/log_posix.cc
index 9fab480a8d..6f93cdefcd 100644
--- a/src/core/lib/support/log_posix.cc
+++ b/src/core/lib/support/log_posix.cc
@@ -35,15 +35,15 @@ static intptr_t gettid(void) { return (intptr_t)pthread_self(); }
 void gpr_log(const char* file, int line, gpr_log_severity severity,
              const char* format, ...) {
   char buf[64];
-  char* allocated = NULL;
-  char* message = NULL;
+  char* allocated = nullptr;
+  char* message = nullptr;
   int ret;
   va_list args;
   va_start(args, format);
   ret = vsnprintf(buf, sizeof(buf), format, args);
   va_end(args);
   if (ret < 0) {
-    message = NULL;
+    message = nullptr;
   } else if ((size_t)ret <= sizeof(buf) - 1) {
     message = buf;
   } else {
@@ -66,7 +66,7 @@ void gpr_default_log(gpr_log_func_args* args) {
 
   timer = (time_t)now.tv_sec;
   final_slash = strrchr(args->file, '/');
-  if (final_slash == NULL)
+  if (final_slash == nullptr)
     display_file = args->file;
   else
     display_file = final_slash + 1;
diff --git a/src/core/lib/support/time_posix.cc b/src/core/lib/support/time_posix.cc
index 47a849480f..b2087c93cf 100644
--- a/src/core/lib/support/time_posix.cc
+++ b/src/core/lib/support/time_posix.cc
@@ -107,7 +107,7 @@ static gpr_timespec now_impl(gpr_clock_type clock) {
   now.clock_type = clock;
   switch (clock) {
     case GPR_CLOCK_REALTIME:
-      gettimeofday(&now_tv, NULL);
+      gettimeofday(&now_tv, nullptr);
       now.tv_sec = now_tv.tv_sec;
       now.tv_nsec = now_tv.tv_usec * 1000;
       break;