diff --git a/include/macros.h b/include/macros.h
index abb6b26..7ace58e 100644
--- a/include/macros.h
+++ b/include/macros.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#ifdef STM32F0
+#if defined(STM32F0) || defined(STM32F1)
 #define PRSZu "u"
 #else
 #define PRSZu "zu"