diff --git a/src/ProcessInfo.cpp b/src/ProcessInfo.cpp
index 3223c43d..2a70e5f8 100644
--- a/src/ProcessInfo.cpp
+++ b/src/ProcessInfo.cpp
@@ -322,6 +322,10 @@ bool NullProcessInfo::readProcessInfo(int /*pid*/ , bool /*enableEnvironmentRead
     return false;
 }
 
+void NullProcessInfo::readUserName()
+{
+}
+
 UnixProcessInfo::UnixProcessInfo(int pid,bool enableEnvironmentRead)
     : ProcessInfo(pid,enableEnvironmentRead)
 {
diff --git a/src/ProcessInfo.h b/src/ProcessInfo.h
index d5a06604..9f079138 100644
--- a/src/ProcessInfo.h
+++ b/src/ProcessInfo.h
@@ -338,6 +338,7 @@ public:
     explicit NullProcessInfo(int pid,bool readEnvironment = false);
 protected:
     virtual bool readProcessInfo(int pid,bool readEnvironment);
+    virtual void readUserName(void);
 };
 
 /**