diff --git a/src/main.cpp b/src/main.cpp
index 011fd57..93b217b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -36,7 +36,7 @@ int sortAlignment_flag;
 int terminalAlignments_flag;
 int maxThreads = 0;
 
-uint32_t kLen = 21;
+uint32_t kLen = 63;
 uint8_t kPrefixLen = 31;
 Buf<uint8_t> *seqBuf, *seqBuf2;