diff --git a/src/generator.cpp b/src/generator.cpp
index 74ef1d5..2aaa27a 100644
--- a/src/generator.cpp
+++ b/src/generator.cpp
@@ -86,11 +86,11 @@ void Generator::SetArguments(const int argc, char* argv[]) {
         }
         if (tempStr == "-k") {
             setup.isPrefixSet = true;
-            setup.prefixLength = std::stoi(argv[i+1]);
+            setup.prefixLength = std::stoi(argv[i+1]) + 1;
         }
         if (tempStr == "-n") {
             setup.isOutputSet = true;
-            setup.outputLength = std::stoi(argv[i+1]);
+            setup.outputLength = std::stoi(argv[i+1]) + 1;
         }
         if (tempStr == "-h") {
             PrintUsage();