diff --git a/src/detail/ca-profile.cpp b/src/detail/ca-profile.cpp
index 7986830..0f1ad01 100644
--- a/src/detail/ca-profile.cpp
+++ b/src/detail/ca-profile.cpp
@@ -66,7 +66,7 @@
       auto challengeType = item.second.get(CONFIG_CHALLENGE, "");
       challengeType = boost::algorithm::to_lower_copy(challengeType);
       if (challengeType == "") {
-        NDN_THROW(std::runtime_error("Challenge type canont be empty."));
+        NDN_THROW(std::runtime_error("Challenge type cannot be empty."));
       }
       if (!ChallengeModule::isChallengeSupported(challengeType)) {
         NDN_THROW(std::runtime_error("Challenge " + challengeType + " is not supported."));