diff --git a/src/server/shared/Logging/Appender.h b/src/server/shared/Logging/Appender.h
index 09ee607005..f5d3b254ef 100644
--- a/src/server/shared/Logging/Appender.h
+++ b/src/server/shared/Logging/Appender.h
@@ -22,6 +22,7 @@
 #include <string>
 #include <time.h>
 #include <type_traits>
+#include <vector>
 #include <utility>
 #include "Define.h"
 
@@ -126,6 +127,8 @@ class InvalidAppenderArgsException : public std::length_error
 {
 public:
     using std::length_error::length_error;
+
+    explicit InvalidAppenderArgsException(std::string const& message) : length_error(message) { }
 };
 
 #endif
diff --git a/src/server/shared/Logging/Log.cpp b/src/server/shared/Logging/Log.cpp
index 88ce78f0d8..5075815ad5 100644
--- a/src/server/shared/Logging/Log.cpp
+++ b/src/server/shared/Logging/Log.cpp
@@ -116,7 +116,7 @@ void Log::CreateAppenderFromConfig(std::string const& appenderName)
     }
     catch (InvalidAppenderArgsException const& iaae)
     {
-        fprintf(stderr, iaae.what());
+        fprintf(stderr, "%s", iaae.what());
     }
 }