diff --git a/src/update/prefix-update-processor.cpp b/src/update/prefix-update-processor.cpp
index 0e20c8c..3552123 100644
--- a/src/update/prefix-update-processor.cpp
+++ b/src/update/prefix-update-processor.cpp
@@ -126,7 +126,7 @@
 bool
 PrefixUpdateProcessor::addOrDeletePrefix(const ndn::Name& prefix, bool addPrefix)
 {
-  std::string value = " prefix " + prefix.toUri();;
+  std::string value = " prefix " + prefix.toUri();
   std::string fileString;
   std::string line;
   std::string trimedLine;