diff --git a/include/nod/DiscBase.hpp b/include/nod/DiscBase.hpp
index 87ac776..f5d54be 100644
--- a/include/nod/DiscBase.hpp
+++ b/include/nod/DiscBase.hpp
@@ -351,8 +351,9 @@ public:
   const Header& getHeader() const { return m_header; }
   const IDiscIO& getDiscIO() const { return *m_discIO; }
   size_t getPartitonNodeCount(size_t partition = 0) const {
-    if (partition > m_partitions.size())
+    if (partition >= m_partitions.size()) {
       return -1;
+    }
     return m_partitions[partition]->getNodeCount();
   }