diff --git a/src/blackmisc/filelogger.cpp b/src/blackmisc/filelogger.cpp
index 430ac2a55..c35c0280a 100644
--- a/src/blackmisc/filelogger.cpp
+++ b/src/blackmisc/filelogger.cpp
@@ -69,13 +69,16 @@ namespace BlackMisc
         if (statusMessage.isEmpty()) { return; }
         if (!m_logFile.isOpen()) { return; }
         if (! m_logPattern.match(statusMessage)) { return; }
+        const QString categories = statusMessage.getCategoriesAsString();
+        if (categories != m_previousCategories)
+        {
+            writeContentToFile(QStringLiteral("\n[") % categories % QStringLiteral("]"));
+            m_previousCategories = categories;
+        }
         const QString finalContent(QDateTime::currentDateTime().toString(QStringLiteral("hh:mm:ss "))
                                    % statusMessage.getSeverityAsString()
                                    % ": "
-                                   % statusMessage.getMessage()
-                                   % " cat: "
-                                   % statusMessage.getCategoriesAsString()
-                                  );
+                                   % statusMessage.getMessage());
 
         writeContentToFile(finalContent);
     }
diff --git a/src/blackmisc/filelogger.h b/src/blackmisc/filelogger.h
index 202b8a89c..69a87e29f 100644
--- a/src/blackmisc/filelogger.h
+++ b/src/blackmisc/filelogger.h
@@ -70,6 +70,7 @@ namespace BlackMisc
         QTextStream m_stream;
         QString m_applicationName;
         QString m_logPath; //!< Empty by default. Hence the working directory "." is used
+        QString m_previousCategories;
     };
 }
 
diff --git a/src/blackmisc/weather/metardecoder.cpp b/src/blackmisc/weather/metardecoder.cpp
index 7e64acf57..77cab4154 100644
--- a/src/blackmisc/weather/metardecoder.cpp
+++ b/src/blackmisc/weather/metardecoder.cpp
@@ -84,7 +84,10 @@ namespace BlackMisc
                 }
                 while (isRepeatable());
 
-                if (!isValid) { CLogMessage(this).debug() << "Failed to match" << getDecoderType() << "in remaining METAR:" << metarString; }
+                if (!isValid)
+                {
+                    CLogMessage(static_cast<CMetarDecoder*>(nullptr)).debug() << "Failed to match" << getDecoderType() << "in remaining METAR:" << metarString;
+                }
                 return isValid;
             }
         };
diff --git a/src/blackmisc/weather/metardecoder.h b/src/blackmisc/weather/metardecoder.h
index 897a5b00e..f1222dc51 100644
--- a/src/blackmisc/weather/metardecoder.h
+++ b/src/blackmisc/weather/metardecoder.h
@@ -30,8 +30,9 @@ namespace BlackMisc
         //! Metar Decoder
         class BLACKMISC_EXPORT CMetarDecoder : public QObject
         {
-        public:
+            Q_OBJECT
 
+        public:
             //! Default constructor
             CMetarDecoder();
 
@@ -44,7 +45,6 @@ namespace BlackMisc
         private:
             void allocateDecoders();
             std::vector<std::unique_ptr<IMetarDecoderPart>> m_decoders;
-
         };
 
     } // namespace