Index: /trunk/src/VBox/Runtime/common/string/base64.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/string/base64.cpp	(revision 84273)
+++ /trunk/src/VBox/Runtime/common/string/base64.cpp	(revision 84274)
@@ -507,4 +507,5 @@
     char const      chEol0 = g_aachEolStyles[fFlags & RTBASE64_FLAGS_EOL_STYLE_MASK][0];
     char const      chEol1 = g_aachEolStyles[fFlags & RTBASE64_FLAGS_EOL_STYLE_MASK][1];
+    Assert(cchEol == (chEol0 != '\0' ? 1U : 0U) + (chEol1 != '\0' ? 1U : 0U));
 
     /*