diff --git a/datatest.cpp b/datatest.cpp
index b1f05430..d4e7cb36 100644
--- a/datatest.cpp
+++ b/datatest.cpp
@@ -116,16 +116,17 @@ void PutDecodedDatumInto(const TestData &data, const char *name, BufferedTransfo
 			s1 = s1.substr(s1.find(' ')+1);
 		}
 
-		// Use like this (from Threefish test vectors, which supplies byte-reversed values):
-		//   Key: ce BC2560EFC6BBA2B1 E3361F162238EB40 FB8631EE0ABBD175 7B9479D4C5479ED1
-		// The 'ce' means BC2560EFC6BBA2B1 will be processed into B1A2BBC6EF6025BC.
-		if (s1.length() >= 3 && s1.substr(0,3) == "ce ")
+		// Convert endian order. Use it with 64-bit words like this:
+		//   Key: cvt BC2560EFC6BBA2B1 E3361F162238EB40 FB8631EE0ABBD175 7B9479D4C5479ED1
+		// BC2560EFC6BBA2B1 will be processed into B1A2BBC6EF6025BC.
+		if (s1.length() >= 3 && s1.substr(0,3) == "cvt")
 		{
 			word64 value;
 			std::istringstream iss(s1.substr(3));
 			while (iss >> std::hex >> value)
 				q.Put((const byte *)&value, 8);
 
+			s1.clear(); s2.clear();
 			goto end;
 		}