1 files changed, 4 insertions, 1 deletions
diff --git a/src/common/tusb_debug.h b/src/common/tusb_debug.h
index e3f9d3f18..a7bf3e959 100644
--- a/src/common/tusb_debug.h
+++ b/src/common/tusb_debug.h
@@ -55,6 +55,7 @@ void tu_print_mem(void const *buf, uint32_t count, uint8_t indent);
   extern int CFG_TUSB_DEBUG_PRINTF(const char *format, ...);
   #define tu_printf    CFG_TUSB_DEBUG_PRINTF
 #else
+  #include <stdio.h>
   #define tu_printf    printf
 #endif
 
@@ -118,7 +119,9 @@ static inline const char* tu_lookup_find(tu_lookup_table_t const* p_table, uint3
 
   // not found return the key value in hex
   static char not_found[11];
-  snprintf(not_found, sizeof(not_found), "0x%08lX", (unsigned long) key);
+  if (snprintf(not_found, sizeof(not_found), "0x%08lX", (unsigned long) key) <= 0) {
+    not_found[0] = 0;
+  }
   return not_found;
 }