diff --git a/cores/esp8266/core_esp8266_features.h b/cores/esp8266/core_esp8266_features.h
index 6b8e22c9b0..e2ea5fe281 100644
--- a/cores/esp8266/core_esp8266_features.h
+++ b/cores/esp8266/core_esp8266_features.h
@@ -20,7 +20,6 @@
 
  */
 
-
 #ifndef CORE_ESP8266_FEATURES_H
 #define CORE_ESP8266_FEATURES_H
 
@@ -36,28 +35,29 @@
 
 #include <stdlib.h> // malloc()
 #include <stddef.h> // size_t
+#include <stdint.h> // int type
 
-namespace arduino
+namespace arduino
 {
-    extern "C++"
-    template <typename T, typename ...TConstructorArgs>
-    T* new0 (size_t n, TConstructorArgs... TconstructorArgs)
+    extern "C++"
+    template <typename T, typename ...TConstructorArgs>
+    T* new0 (size_t n, TConstructorArgs... TconstructorArgs)
     {
         // n==0: single allocation, otherwise it is an array
         size_t offset = n? sizeof(size_t): 0;
-        size_t arraysize = n? n: 1;
-        T* ptr = (T*)malloc(offset + (arraysize * sizeof(T)));
-        if (ptr)
-        {
-            if (n)
-                *(size_t*)(ptr) = n;
-            for (size_t i = 0; i < arraysize; i++)
-                new (ptr + offset + i * sizeof(T)) T(TconstructorArgs...);
-            return ptr + offset;
+        size_t arraysize = n? n: 1;
+        T* ptr = (T*)malloc(offset + (arraysize * sizeof(T)));
+        if (ptr)
+        {
+            if (n)
+                *(size_t*)(ptr) = n;
+            for (size_t i = 0; i < arraysize; i++)
+                new (ptr + offset + i * sizeof(T)) T(TconstructorArgs...);
+            return ptr + offset;
         }
-        return nullptr;
-    }
-}
+        return nullptr;
+    }
+}
 
 #define arduino_new(Type, ...) arduino::new0<Type>(0, ##__VA_ARGS__)
 #define arduino_newarray(Type, n, ...) arduino::new0<Type>(n, ##__VA_ARGS__)
@@ -85,8 +85,8 @@ namespace arduino
 #define xt_rsil(level) (__extension__({uint32_t state; __asm__ __volatile__("rsil %0," __STRINGIFY(level) : "=a" (state) :: "memory"); state;}))
 #define xt_wsr_ps(state)  __asm__ __volatile__("wsr %0,ps; isync" :: "a" (state) : "memory")
 
-inline uint32_t esp_get_cycle_count() __attribute__((always_inline));
-inline uint32_t esp_get_cycle_count() {
+inline uint32_t esp_get_cycle_count() __attribute__((always_inline));
+inline uint32_t esp_get_cycle_count() {
   uint32_t ccount;
   __asm__ __volatile__("rsr %0,ccount":"=a"(ccount));
   return ccount;