diff --git a/firmware/arch/arm/include/biosincludes.h b/firmware/arch/arm/include/biosincludes.h
index b2793d5f48..e48f7c1b62 100644
--- a/firmware/arch/arm/include/biosincludes.h
+++ b/firmware/arch/arm/include/biosincludes.h
@@ -21,6 +21,7 @@ typedef unsigned int size_t;
 
 #define UINT32_C(x) ((uint32_t) x)
 #define UINT64_C(x) ((uint64_t) x)
+#define PRIu32 "u"
 #define PRIu64 "llu"
 extern void debug(const char *format, ...);