diff --git a/src/dictionary.cpp b/src/dictionary.cpp
index f171dd4..0ff0b05 100644
--- a/src/dictionary.cpp
+++ b/src/dictionary.cpp
@@ -466,7 +466,7 @@ bool Dictionary::compile(const Param &param,
   Darts::DoubleArray da;
   CHECK_DIE(da.build(str.size(), const_cast<char **>(&str[0]),
                      &len[0], &val[0], &progress_bar_darts) == 0)
-      << "unkown error in building double-array";
+      << "unknown error in building double-array";
 
   std::string tbuf;
   for (size_t i = 0; i < dic.size(); ++i) {
diff --git a/src/writer.cpp b/src/writer.cpp
index ed68767..0ef6975 100644
--- a/src/writer.cpp
+++ b/src/writer.cpp
@@ -60,7 +60,7 @@ bool Writer::open(const Param &param) {
       eon_format_key += "-";
       eon_format_key += ostyle;
       const std::string tmp = param.get<std::string>(node_format_key.c_str());
-      CHECK_FALSE(!tmp.empty()) << "unkown format type [" << ostyle << "]";
+      CHECK_FALSE(!tmp.empty()) << "unknown format type [" << ostyle << "]";
     }
 
     const std::string node_format2 =