diff --git a/src/fsfw/globalfunctions/DleParser.cpp b/src/fsfw/globalfunctions/DleParser.cpp
index b68dbde1..71da7e6a 100644
--- a/src/fsfw/globalfunctions/DleParser.cpp
+++ b/src/fsfw/globalfunctions/DleParser.cpp
@@ -187,7 +187,7 @@ void DleParser::defaultErrorHandler(ErrorTypes err, ErrorInfo ctx) {
     case (ErrorTypes::ENCODED_BUF_TOO_SMALL):
     case (ErrorTypes::DECODING_BUF_TOO_SMALL): {
       char opt[64];
-      snprintf(opt, sizeof(opt), ": Too small for packet with length %d", ctx.len);
+      snprintf(opt, sizeof(opt), ": Too small for packet with length %zu", ctx.len);
       if (err == ErrorTypes::ENCODED_BUF_TOO_SMALL) {
         errorPrinter("Encoded buf too small", opt);
       } else {