diff --git a/cpu/avr8_common/include/cpu.h b/cpu/avr8_common/include/cpu.h
index 6e183661e7..c9f5c63a3d 100644
--- a/cpu/avr8_common/include/cpu.h
+++ b/cpu/avr8_common/include/cpu.h
@@ -57,6 +57,11 @@ extern "C"
 #endif
 /** @} */
 
+/**
+ * @brief   CPU cycles per busy wait loop
+ */
+#define CPU_CYCLES_PER_LOOP (7)
+
 /**
  * @name    Use shared I2C functions
  * @{