diff --git a/eeschema/sch_sheet_path.cpp b/eeschema/sch_sheet_path.cpp
index ef88063cd3..4475aa9cc6 100644
--- a/eeschema/sch_sheet_path.cpp
+++ b/eeschema/sch_sheet_path.cpp
@@ -51,12 +51,7 @@ namespace std
 {
     size_t hash<SCH_SHEET_PATH>::operator()( const SCH_SHEET_PATH& path ) const
     {
-        size_t seed = 0;
-
-        for( auto sheet : path )
-            boost::hash_combine( seed, sheet->GetTimeStamp() );
-
-        return seed;
+        return path.GetCurrentHash();
     }
 }
 
@@ -64,6 +59,16 @@ namespace std
 SCH_SHEET_PATH::SCH_SHEET_PATH()
 {
     m_pageNumber = 0;
+    m_current_hash = 0;
+}
+
+
+void SCH_SHEET_PATH::Rehash()
+{
+    m_current_hash = 0;
+
+    for( auto sheet : m_sheets )
+        boost::hash_combine( m_current_hash, sheet->GetTimeStamp() );
 }
 
 
@@ -339,16 +344,7 @@ bool SCH_SHEET_PATH::SetComponentFootprint( const wxString& aReference, const wx
 
 bool SCH_SHEET_PATH::operator==( const SCH_SHEET_PATH& d1 ) const
 {
-    if( size() != d1.size() )
-        return false;
-
-    for( unsigned i = 0; i < size(); i++ )
-    {
-        if( at( i ) != d1[i] )
-            return false;
-    }
-
-    return true;
+    return m_current_hash == d1.GetCurrentHash();
 }
 
 
diff --git a/eeschema/sch_sheet_path.h b/eeschema/sch_sheet_path.h
index 94b1f56f21..8bb0680d82 100644
--- a/eeschema/sch_sheet_path.h
+++ b/eeschema/sch_sheet_path.h
@@ -89,8 +89,6 @@ class SCH_REFERENCE_LIST;
 
 #define SHEET_NOT_FOUND          -1
 
-typedef std::vector< SCH_SHEET* > SCH_SHEETS;   // no ownership over contained SCH_SHEETs
-
 
 /**
  * Type SCH_MULTI_UNIT_REFERENCE_MAP
@@ -111,13 +109,52 @@ typedef std::map<wxString, SCH_REFERENCE_LIST> SCH_MULTI_UNIT_REFERENCE_MAP;
  * "path" from the first to the last sheet.
  * </p>
  */
-class SCH_SHEET_PATH : public SCH_SHEETS
+class SCH_SHEET_PATH
 {
+protected:
+    std::vector< SCH_SHEET* > m_sheets;
+
+    size_t m_current_hash;
+
     int m_pageNumber;              /// Page numbers are maintained by the sheet load order.
 
 public:
     SCH_SHEET_PATH();
 
+    /// Forwarded method from std::vector
+    SCH_SHEET* at( size_t aIndex ) const { return m_sheets.at( aIndex ); }
+
+    /// Forwarded method from std::vector
+    void clear()
+    {
+        m_sheets.clear();
+        Rehash();
+    }
+
+    /// Forwarded method from std::vector
+    bool empty() const { return m_sheets.empty(); }
+
+    /// Forwarded method from std::vector
+    void pop_back()
+    {
+        m_sheets.pop_back();
+        Rehash();
+    }
+
+    /// Forwarded method from std::vector
+    void push_back( SCH_SHEET* aSheet )
+    {
+        m_sheets.push_back( aSheet );
+        Rehash();
+    }
+
+    /// Forwarded method from std::vector
+    size_t size() const { return m_sheets.size(); }
+
+    void Rehash();
+
+    size_t GetCurrentHash() const { return m_current_hash; }
+
     void SetPageNumber( int aPageNumber ) { m_pageNumber = aPageNumber; }
 
     int GetPageNumber() const { return m_pageNumber; }
@@ -303,6 +340,9 @@ public:
     bool operator==( const SCH_SHEET_PATH& d1 ) const;
 
     bool operator!=( const SCH_SHEET_PATH& d1 ) const { return !( *this == d1 ) ; }
+
+    bool operator<( const SCH_SHEET_PATH& d1 ) const { return m_sheets < d1.m_sheets; }
+
 };