diff --git a/dbms/src/Server/ExtractFromConfig.cpp b/dbms/src/Server/ExtractFromConfig.cpp
index bb3607f39f5..db8d7ff1597 100644
--- a/dbms/src/Server/ExtractFromConfig.cpp
+++ b/dbms/src/Server/ExtractFromConfig.cpp
@@ -6,12 +6,27 @@
 #include <Poco/FormattingChannel.h>
 #include <Poco/PatternFormatter.h>
 #include <Poco/AutoPtr.h>
+#include <Poco/String.h>
 
 #include <Common/Config/ConfigProcessor.h>
 #include <Common/Exception.h>
 #include <Common/Config/TOMLConfiguration.h>
 
 
+static std::string normalize(const std::string & log_level)
+{
+    std::string norm = Poco::toLower(log_level);
+    // normalize
+    // info -> information
+    // warn -> warning
+    if (norm == "info")
+        return "information";
+    else if (norm == "warn")
+        return "warning";
+    else
+        return norm;
+}
+
 static void setupLogging(const std::string & log_level)
 {
     Poco::AutoPtr<Poco::ConsoleChannel> channel(new Poco::ConsoleChannel);
@@ -19,7 +34,7 @@ static void setupLogging(const std::string & log_level)
     formatter->setProperty("pattern", "%L%Y-%m-%d %H:%M:%S.%i <%p> %s: %t");
     Poco::AutoPtr<Poco::FormattingChannel> formatting_channel(new Poco::FormattingChannel(formatter, channel));
     Poco::Logger::root().setChannel(formatting_channel);
-    Poco::Logger::root().setLevel(log_level);
+    Poco::Logger::root().setLevel(normalize(log_level));
 }
 
 static std::string extractFromConfig(