diff --git a/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp b/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp
index 6e30cbef..373aa7d7 100644
--- a/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp
+++ b/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp
@@ -123,10 +123,11 @@ void fsfwPrint(const sif::PrintLevel printType, const char* fmt, va_list arg) {
   if (replaceLastCharWithNewline) {
     const size_t stringLength = strlen(bufferPosition);
     const size_t lastCharPosition =
-        etl::min(stringLength - 1, fsfwconfig::FSFW_PRINT_BUFFER_SIZE - 2);
+        etl::min(stringLength - 1, fsfwconfig::FSFW_PRINT_BUFFER_SIZE - 3);
     const char lastChar = printBufferArray[bufferIdx][lastCharPosition];
     if (!(lastChar == '\n' or lastChar == '\r')) {
-      printBufferArray[bufferIdx][lastCharPosition] = '\n';
+      printBufferArray[bufferIdx][lastCharPosition + 1] = '\n';
+      printBufferArray[bufferIdx][lastCharPosition + 2] = 0;
     }
   }