diff --git a/src/Rules.cpp b/src/Rules.cpp
index 73d6dc64..3e4ce1ad 100644
--- a/src/Rules.cpp
+++ b/src/Rules.cpp
@@ -149,13 +149,17 @@ std::string Rules::get (const std::string& key) const
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-int Rules::getInteger (const std::string& key) const
+int Rules::getInteger (const std::string& key, int defaultValue) const
 {
   auto found = _settings.find (key);
-  if (found != _settings.end ())
-    return strtoimax (found->second.c_str (), nullptr, 10);
+  if (found != _settings.end ()) {
+    int tmp = strtoimax (found->second.c_str (), nullptr, 10);
+    // If conversion has performed, return the conversion.
+    if (tmp != 0)
+     return tmp;
+  }
 
-  return 0;
+  return defaultValue;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/Rules.h b/src/Rules.h
index cd07b568..9669c5dc 100644
--- a/src/Rules.h
+++ b/src/Rules.h
@@ -41,7 +41,7 @@ public:
 
   bool        has        (const std::string&) const;
   std::string get        (const std::string&) const;
-  int         getInteger (const std::string&) const;
+  int         getInteger (const std::string&, int defaultValue = 0) const;
   double      getReal    (const std::string&) const;
   bool        getBoolean (const std::string&) const;