diff --git a/targets/stm32l432/bootloader/bootloader.c b/targets/stm32l432/bootloader/bootloader.c
index 325572e..cf582c8 100644
--- a/targets/stm32l432/bootloader/bootloader.c
+++ b/targets/stm32l432/bootloader/bootloader.c
@@ -316,3 +316,10 @@ void bootloader_heartbeat()
 
     led_rgb(((val * g)<<8) | ((val*r) << 16) | (val*b));
 }
+
+uint32_t ctap_atomic_count(uint32_t amount)
+{
+    static uint32_t count = 1000;
+    count += (amount + 1);
+    return count;
+}
\ No newline at end of file
diff --git a/targets/stm32l432/src/device.c b/targets/stm32l432/src/device.c
index 54a51b4..dd4e9c5 100644
--- a/targets/stm32l432/src/device.c
+++ b/targets/stm32l432/src/device.c
@@ -410,6 +410,7 @@ void authenticator_write_state(AuthenticatorState * a, int backup)
     }
 }
 
+#if !defined(IS_BOOTLOADER)
 uint32_t ctap_atomic_count(uint32_t amount)
 {
     int offset = 0;
@@ -501,7 +502,7 @@ uint32_t ctap_atomic_count(uint32_t amount)
 
     return lastc;
 }
-
+#endif
 
 
 void device_manage(void)