diff --git a/README.md b/README.md
index 75a11c3..0244148 100644
--- a/README.md
+++ b/README.md
@@ -49,12 +49,12 @@ target_link_libraries(your_project_target defer.hpp)
 ### Basic Defer
 
 ```cpp
-if ( FILE *file = ::fopen("output.txt", "a") ) {
+if ( FILE *file = std::fopen("output.txt", "a") ) {
     // defer will close the file after scope or on exception
-    DEFER([file]{ ::fclose(file); });
+    DEFER([file]{ std::fclose(file); });
 
     const char buffer[] = "hello world\n";
-    if ( 12 != ::fwrite(buffer, sizeof(buffer[0]), ::strlen(buffer), file) ) {
+    if ( 12 != std::fwrite(buffer, sizeof(buffer[0]), std::strlen(buffer), file) ) {
         throw std::runtime_error("some exception");
     }
 }
@@ -63,9 +63,9 @@ if ( FILE *file = ::fopen("output.txt", "a") ) {
 ### Error Defer
 
 ```cpp
-if ( FILE *file = ::fopen("output.txt", "a") ) {
+if ( FILE *file = std::fopen("output.txt", "a") ) {
     // defer will close the file after scope or on exception
-    DEFER([file]{ ::fclose(file); });
+    DEFER([file]{ std::fclose(file); });
 
     // error defer will be called on exception
     ERROR_DEFER([]{
@@ -73,7 +73,7 @@ if ( FILE *file = ::fopen("output.txt", "a") ) {
     });
 
     const char buffer[] = "hello world\n";
-    if ( 12 != ::fwrite(buffer, sizeof(buffer[0]), ::strlen(buffer), file) ) {
+    if ( 12 != std::fwrite(buffer, sizeof(buffer[0]), std::strlen(buffer), file) ) {
         throw std::runtime_error("some exception");
     }
 }
@@ -82,9 +82,9 @@ if ( FILE *file = ::fopen("output.txt", "a") ) {
 ### Return Defer
 
 ```cpp
-if ( FILE *file = ::fopen("output.txt", "a") ) {
+if ( FILE *file = std::fopen("output.txt", "a") ) {
     // defer will close the file after scope or on exception
-    DEFER([file]{ ::fclose(file); });
+    DEFER([file]{ std::fclose(file); });
 
     // return defer will be called on successful scope exit
     RETURN_DEFER([]{
@@ -92,7 +92,7 @@ if ( FILE *file = ::fopen("output.txt", "a") ) {
     });
 
     const char buffer[] = "hello world\n";
-    if ( 12 != ::fwrite(buffer, sizeof(buffer[0]), ::strlen(buffer), file) ) {
+    if ( 12 != std::fwrite(buffer, sizeof(buffer[0]), std::strlen(buffer), file) ) {
         throw std::runtime_error("some exception");
     }
 }
diff --git a/untests/defer_examples.cpp b/untests/defer_examples.cpp
index e7e53bf..b1a4dc8 100644
--- a/untests/defer_examples.cpp
+++ b/untests/defer_examples.cpp
@@ -7,26 +7,29 @@
 #define CATCH_CONFIG_FAST_COMPILE
 #include <catch2/catch.hpp>
 
+#include <cstdio>
+#include <cstring>
 #include <iostream>
+
 #include <defer.hpp/defer.hpp>
 
 TEST_CASE("examples") {
     SECTION("basic_defer") {
-        if ( FILE *file = ::fopen("output.txt", "a") ) {
+        if ( FILE *file = std::fopen("output.txt", "a") ) {
             // defer will close the file after scope or on exception
-            DEFER([file]{ ::fclose(file); });
+            DEFER([file]{ std::fclose(file); });
 
             const char buffer[] = "hello world\n";
-            if ( 12 != ::fwrite(buffer, sizeof(buffer[0]), ::strlen(buffer), file) ) {
+            if ( 12 != std::fwrite(buffer, sizeof(buffer[0]), std::strlen(buffer), file) ) {
                 throw std::runtime_error("some exception");
             }
         }
     }
 
     SECTION("error_defer") {
-        if ( FILE *file = ::fopen("output.txt", "a") ) {
+        if ( FILE *file = std::fopen("output.txt", "a") ) {
             // defer will close the file after scope or on exception
-            DEFER([file]{ ::fclose(file); });
+            DEFER([file]{ std::fclose(file); });
 
             // error defer will be called on exception
             ERROR_DEFER([]{
@@ -34,16 +37,16 @@ TEST_CASE("examples") {
             });
 
             const char buffer[] = "hello world\n";
-            if ( 12 != ::fwrite(buffer, sizeof(buffer[0]), ::strlen(buffer), file) ) {
+            if ( 12 != std::fwrite(buffer, sizeof(buffer[0]), std::strlen(buffer), file) ) {
                 throw std::runtime_error("some exception");
             }
         }
     }
 
     SECTION("return_defer") {
-        if ( FILE *file = ::fopen("output.txt", "a") ) {
+        if ( FILE *file = std::fopen("output.txt", "a") ) {
             // defer will close the file after scope or on exception
-            DEFER([file]{ ::fclose(file); });
+            DEFER([file]{ std::fclose(file); });
 
             // return defer will be called on successful scope exit
             RETURN_DEFER([]{
@@ -51,7 +54,7 @@ TEST_CASE("examples") {
             });
 
             const char buffer[] = "hello world\n";
-            if ( 12 != ::fwrite(buffer, sizeof(buffer[0]), ::strlen(buffer), file) ) {
+            if ( 12 != std::fwrite(buffer, sizeof(buffer[0]), std::strlen(buffer), file) ) {
                 throw std::runtime_error("some exception");
             }
         }