diff --git a/firmware/src/board/gpio.rs b/firmware/src/board/gpio.rs
index e0e7533..6604943 100644
--- a/firmware/src/board/gpio.rs
+++ b/firmware/src/board/gpio.rs
@@ -62,7 +62,7 @@ def_gpio!(GPIO_PORTB_AHB, PB4, 4);
 pub struct PB5;
 def_gpio!(GPIO_PORTB_AHB, PB5, 5);
 pub struct PE4;
-def_gpio!(GPIO_PORTE_AHB, PE4, 5);
+def_gpio!(GPIO_PORTE_AHB, PE4, 4);
 pub struct PE5;
 def_gpio!(GPIO_PORTE_AHB, PE5, 5);