diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb3fd0a..bd99a46 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -89,6 +89,7 @@ endfunction()
 picowota_retrieve_variable(PICOWOTA_WIFI_SSID false)
 picowota_retrieve_variable(PICOWOTA_WIFI_PASS true)
 picowota_retrieve_variable(PICOWOTA_WIFI_AP false)
+picowota_retrieve_variable(PICOWOTA_ENTRY_PIN false)
 
 if ((NOT PICOWOTA_WIFI_SSID) OR (NOT PICOWOTA_WIFI_PASS))
         message(FATAL_ERROR
@@ -107,6 +108,11 @@ if (PICOWOTA_WIFI_AP)
 	message("Building in WiFi AP mode.")
 endif()
 
+if (PICOWOTA_ENTRY_PIN)
+	target_compile_definitions(picowota PUBLIC PICOWOTA_ENTRY_PIN=${PICOWOTA_ENTRY_PIN})
+	message("Building with custom PICOWOTA_ENTRY_PIN.")
+endif()
+
 # Provide a helper to build a standalone target
 function(picowota_build_standalone NAME)
 	get_target_property(PICOWOTA_SRC_DIR picowota SOURCE_DIR)
diff --git a/README.md b/README.md
index 559aab9..9c9ce57 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ as CMake variables:
 PICOWOTA_WIFI_SSID # The WiFi network SSID
 PICOWOTA_WIFI_PASS # The WiFi network password
 PICOWOTA_WIFI_AP # Optional; 0 = connect to the network, 1 = create it
+PICOWOTA_ENTRY_PIN # Optional; default use pin 15, you can change it
 ```
 
 Then, you can either build just your standalone app binary (suitable for
diff --git a/main.c b/main.c
index 80b892e..f558ebc 100644
--- a/main.c
+++ b/main.c
@@ -83,7 +83,11 @@ struct event {
 	};
 };
 
+#ifndef PICOWOTA_ENTRY_PIN
 #define BOOTLOADER_ENTRY_PIN 15
+#else
+#define BOOTLOADER_ENTRY_PIN PICOWOTA_ENTRY_PIN
+#endif
 
 #define TCP_PORT 4242