diff --git a/include/macros.h b/include/macros.h
index 9c195a6..ad809a5 100644
--- a/include/macros.h
+++ b/include/macros.h
@@ -1,5 +1,11 @@
 #pragma once
 
+#ifdef STM32F0
+#define PRSZu "u"
+#else
+#define PRSZu "zu"
+#endif
+
 #include <limits.h>
 
 #define min(x, y) ((x < y) ? (x) : (y))