diff --git a/README.md b/README.md
index faf7bc234..dea5f61e6 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,6 @@ Available [here](https://crowcpp.org).
 
 #### Hello World
 ```cpp
-#define CROW_MAIN
 #include "crow.h"
 
 int main()
diff --git a/docs/getting_started/your_first_application.md b/docs/getting_started/your_first_application.md
index 1eee3f28a..9403c982a 100644
--- a/docs/getting_started/your_first_application.md
+++ b/docs/getting_started/your_first_application.md
@@ -1,11 +1,7 @@
 This page shows how you can get started with a simple hello world application.
 
 ## 1. Include
-Starting with an empty `main.cpp` file, first add `#!cpp #define CROW_MAIN` then `#!cpp #include "crow.h"` or `#!cpp #include "crow_all.h"` if you're using the single header file.
-
-!!! note
-
-    If you're using multiple C++ source files make sure to have `CROW_MAIN` defined only in your main source file.
+Starting with an empty `main.cpp` file, first add `#!cpp #include "crow.h"` or `#!cpp #include "crow_all.h"` if you're using the single header file.
 
 ## 2. App declaration
 Next Create a `main()` and declare a `#!cpp crow::SimpleApp` inside, your code should look like this
@@ -39,7 +35,6 @@ Please note that the `port()` and `multithreaded()` methods aren't needed, Thoug
 Once you've followed all the steps above, your code should look similar to this
 
 ``` cpp linenums="1"
-#define CROW_MAIN //let the compiler know this is your main cpp file
 #include "crow.h"
 //#include "crow_all.h"
 
diff --git a/docs/overrides/home.html b/docs/overrides/home.html
index 4bfd1f21a..34afe8ab7 100644
--- a/docs/overrides/home.html
+++ b/docs/overrides/home.html
@@ -169,7 +169,7 @@ <h1 style="text-align:center;">A Fast and Easy to use microframework for the web
         <h2 style="text-align: center;">Easy to get started</h3>
     </div>
     <div class="scontent">
-        <div class="highlight"><pre id="__code_0"><span></span><button class="md-clipboard md-icon" title="Copy to clipboard" data-clipboard-target="#__code_0 > code"></button><code><span class="cp">#define CROW_MAIN</span>
+        <div class="highlight"><pre id="__code_0"><span></span><button class="md-clipboard md-icon" title="Copy to clipboard" data-clipboard-target="#__code_0 > code"></button><code>
 <span class="cp">#include</span> <span class="cpf">"crow.h"</span><span class="cp"></span>
 
 <span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
diff --git a/examples/example.cpp b/examples/example.cpp
index d7085f39e..3218edca1 100644
--- a/examples/example.cpp
+++ b/examples/example.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 
 #include <sstream>
diff --git a/examples/example_blueprint.cpp b/examples/example_blueprint.cpp
index a7f45b6b7..d8ff85033 100644
--- a/examples/example_blueprint.cpp
+++ b/examples/example_blueprint.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 
 int main()
diff --git a/examples/example_catchall.cpp b/examples/example_catchall.cpp
index 522812a54..036658b29 100644
--- a/examples/example_catchall.cpp
+++ b/examples/example_catchall.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include <crow.h>
 
 
diff --git a/examples/example_chat.cpp b/examples/example_chat.cpp
index d0fa176a6..7b9ec90cb 100644
--- a/examples/example_chat.cpp
+++ b/examples/example_chat.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 #include <string>
 #include <vector>
diff --git a/examples/example_compression.cpp b/examples/example_compression.cpp
index bb617a3b5..55e014a13 100644
--- a/examples/example_compression.cpp
+++ b/examples/example_compression.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 #include "crow/compression.h"
 
diff --git a/examples/example_json_map.cpp b/examples/example_json_map.cpp
index 03b3d9238..bff2f4bb8 100644
--- a/examples/example_json_map.cpp
+++ b/examples/example_json_map.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #define CROW_JSON_USE_MAP
 #include "crow.h"
 
diff --git a/examples/example_static_file.cpp b/examples/example_static_file.cpp
index 908f9e27f..c909d3e46 100644
--- a/examples/example_static_file.cpp
+++ b/examples/example_static_file.cpp
@@ -1,7 +1,6 @@
 //#define CROW_STATIC_DRIECTORY "alternative_directory/"
 //#define CROW_STATIC_ENDPOINT "/alternative_endpoint/<path>"
 //#define CROW_DISABLE_STATIC_DIR
-#define CROW_MAIN
 #include "crow.h"
 
 int main()
@@ -18,10 +17,10 @@ CROW_ROUTE(app, "/")
     res.end();
 });
 
-	
+
 	app.port(18080).run();
-	
-	
+
+
 	return 0;
 }
 
diff --git a/examples/example_vs.cpp b/examples/example_vs.cpp
index 974c2b0f2..108577b45 100644
--- a/examples/example_vs.cpp
+++ b/examples/example_vs.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 
 #include <sstream>
@@ -10,7 +9,7 @@ class ExampleLogHandler : public crow::ILogHandler {
         }
 };
 
-struct ExampleMiddleware 
+struct ExampleMiddleware
 {
     std::string message;
 
@@ -108,7 +107,7 @@ int main()
     app.route_dynamic("/params")
     ([](const crow::request& req){
         std::ostringstream os;
-        os << "Params: " << req.url_params << "\n\n"; 
+        os << "Params: " << req.url_params << "\n\n";
         os << "The key 'foo' was " << (req.url_params.get("foo") == nullptr ? "not " : "") << "found.\n";
         if(req.url_params.get("pew") != nullptr) {
             double countD = boost::lexical_cast<double>(req.url_params.get("pew"));
@@ -120,7 +119,7 @@ int main()
             os << " - " << countVal << '\n';
         }
         return crow::response{os.str()};
-    });    
+    });
 
     // ignore all log
     crow::logger::setLogLevel(crow::LogLevel::Debug);
diff --git a/examples/example_with_all.cpp b/examples/example_with_all.cpp
index 2ab5fc8b8..8f0f028bc 100644
--- a/examples/example_with_all.cpp
+++ b/examples/example_with_all.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow_all.h"
 
 #include <sstream>
@@ -96,7 +95,7 @@ int main()
     CROW_ROUTE(app, "/params")
     ([](const crow::request& req){
         std::ostringstream os;
-        os << "Params: " << req.url_params << "\n\n"; 
+        os << "Params: " << req.url_params << "\n\n";
         os << "The key 'foo' was " << (req.url_params.get("foo") == nullptr ? "not " : "") << "found.\n";
         if(req.url_params.get("pew") != nullptr) {
             double countD = boost::lexical_cast<double>(req.url_params.get("pew"));
@@ -108,7 +107,7 @@ int main()
             os << " - " << countVal << '\n';
         }
         return crow::response{os.str()};
-    });    
+    });
 
     // ignore all log
     crow::logger::setLogLevel(crow::LogLevel::Debug);
diff --git a/examples/helloworld.cpp b/examples/helloworld.cpp
index c12b8c41e..2a44c65c3 100644
--- a/examples/helloworld.cpp
+++ b/examples/helloworld.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 
 int main()
diff --git a/examples/ssl/example_ssl.cpp b/examples/ssl/example_ssl.cpp
index 71b362ff3..a8a1cfc5c 100644
--- a/examples/ssl/example_ssl.cpp
+++ b/examples/ssl/example_ssl.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 
 int main()
@@ -14,7 +13,7 @@ int main()
 
     // Use .pem file
     //app.port(18080).ssl_file("test.pem").run();
-    
+
     // Use custom context; see boost::asio::ssl::context
     /*
      * crow::ssl_context_t ctx;
diff --git a/examples/websocket/example_ws.cpp b/examples/websocket/example_ws.cpp
index 7ad0d5d12..bc2832b40 100644
--- a/examples/websocket/example_ws.cpp
+++ b/examples/websocket/example_ws.cpp
@@ -1,4 +1,3 @@
-#define CROW_MAIN
 #include "crow.h"
 #include <unordered_set>
 #include <mutex>
@@ -38,7 +37,7 @@ int main()
         gethostname(name, 256);
         crow::mustache::context x;
         x["servername"] = name;
-	
+
         auto page = crow::mustache::load("ws.html");
         return page.render(x);
      });
diff --git a/include/crow/http_response.h b/include/crow/http_response.h
index 5eedce065..aad683acd 100644
--- a/include/crow/http_response.h
+++ b/include/crow/http_response.h
@@ -78,7 +78,7 @@ namespace crow
         {
             *this = std::move(r);
         }
-        
+
         response(std::string contentType, std::string body) : body(std::move(body))
         {
             set_header("Content-Type", mime_types.at(contentType));
diff --git a/tests/ssl/ssltest.cpp b/tests/ssl/ssltest.cpp
index 901d2b855..d803be747 100644
--- a/tests/ssl/ssltest.cpp
+++ b/tests/ssl/ssltest.cpp
@@ -1,6 +1,5 @@
 #define CATCH_CONFIG_MAIN
 #define CROW_LOG_LEVEL 0
-#define CROW_MAIN
 
 #include <thread>
 
diff --git a/tests/unittest.cpp b/tests/unittest.cpp
index 9eb846a83..5937bff7e 100644
--- a/tests/unittest.cpp
+++ b/tests/unittest.cpp
@@ -1,7 +1,6 @@
 #define CATCH_CONFIG_MAIN
 #define CROW_ENABLE_DEBUG
 #define CROW_LOG_LEVEL 0
-#define CROW_MAIN
 #include <sys/stat.h>
 
 #include <iostream>