diff --git a/kernel/src/std/stdio.cpp b/kernel/src/std/stdio.cpp
index 084db751..93ce38da 100644
--- a/kernel/src/std/stdio.cpp
+++ b/kernel/src/std/stdio.cpp
@@ -50,7 +50,7 @@ static int internal_printf(const char* format, PutString put_string_callback, ss
         char current_char = format[format_index];
         if (current_char == '%' || preserve_format)
         {
-            if (format_index + 1 == format_size) // end of format string
+            if (!preserve_format && format_index + 1 == format_size) // end of format string
             {
                 format_index++;
                 continue;