diff --git a/src/scion/math/InterpolationTable/src/generateTables.hpp b/src/scion/math/InterpolationTable/src/generateTables.hpp
index ba63dec..9b782e6 100644
--- a/src/scion/math/InterpolationTable/src/generateTables.hpp
+++ b/src/scion/math/InterpolationTable/src/generateTables.hpp
@@ -63,15 +63,19 @@ void generateTables() {
       }
     }
 
-    std::swap( xStart, xEnd );
-    std::swap( yStart, yEnd );
-    if ( *xStart > *std::prev( xStart ) ) {
+    // don't do this for the last region: valgrind will yell at you
+    if ( xEnd != this->x().end() ) {
 
-      --xStart;
-      --yStart;
+      std::swap( xStart, xEnd );
+      std::swap( yStart, yEnd );
+      if ( *xStart > *std::prev( xStart ) ) {
+
+        --xStart;
+        --yStart;
+      }
     }
   }
 
   this->linearised_ = linearised;
-  this->tables_ = tables;
+  this->tables_ = std::move( tables );
 }
diff --git a/src/scion/math/InterpolationTable/src/processBoundaries.hpp b/src/scion/math/InterpolationTable/src/processBoundaries.hpp
index db7f928..45cc543 100644
--- a/src/scion/math/InterpolationTable/src/processBoundaries.hpp
+++ b/src/scion/math/InterpolationTable/src/processBoundaries.hpp
@@ -120,11 +120,17 @@ processBoundaries( std::vector< X >&& x, std::vector< Y >&& y,
         throw std::exception();
       }
     }
-    if ( *std::next( xIter ) == *xIter ) {
 
-      Log::error( "An x value can only be repeated a maximum of two times" );
-      Log::info( "x = {} is present at least three times", *xIter );
-      throw std::exception();
+    // make sure we do not go beyond the end of the x grid: valgrind will yell at you
+    auto next = std::next( xIter );
+    if ( next < x.end() ) {
+
+      if ( *std::next( xIter ) == *xIter ) {
+
+        Log::error( "An x value can only be repeated a maximum of two times" );
+        Log::info( "x = {} is present at least three times", *xIter );
+        throw std::exception();
+      }
     }
     xIter = std::adjacent_find( xIter, x.end() );
   }
diff --git a/src/scion/math/InterpolationTableFunction/src/generateTables.hpp b/src/scion/math/InterpolationTableFunction/src/generateTables.hpp
index d54d8a2..1bd45a7 100644
--- a/src/scion/math/InterpolationTableFunction/src/generateTables.hpp
+++ b/src/scion/math/InterpolationTableFunction/src/generateTables.hpp
@@ -66,14 +66,18 @@ void generateTables() {
       }
     }
 
-    std::swap( xStart, xEnd );
-    std::swap( fStart, fEnd );
-    if ( *xStart > *std::prev( xStart ) ) {
+    // don't do this for the last region: valgrind will yell at you
+    if ( xEnd != this->x().end() ) {
 
-      --xStart;
-      --fStart;
+      std::swap( xStart, xEnd );
+      std::swap( fStart, fEnd );
+      if ( *xStart > *std::prev( xStart ) ) {
+
+        --xStart;
+        --fStart;
+      }
     }
   }
 
-  this->tables_ = tables;
+  this->tables_ = std::move( tables );
 }
diff --git a/src/scion/math/InterpolationTableFunction/src/processBoundaries.hpp b/src/scion/math/InterpolationTableFunction/src/processBoundaries.hpp
index edda734..5f60209 100644
--- a/src/scion/math/InterpolationTableFunction/src/processBoundaries.hpp
+++ b/src/scion/math/InterpolationTableFunction/src/processBoundaries.hpp
@@ -105,11 +105,17 @@ processBoundaries( std::vector< X >&& x, std::vector< F >&& f,
       Log::error( "A jump in the x grid cannot occur at the end of the x grid" );
       throw std::exception();
     }
-    if ( *std::next( xIter ) == *xIter ) {
 
-      Log::error( "An x value can only be repeated a maximum of two times" );
-      Log::info( "x = {} is present at least three times", *xIter );
-      throw std::exception();
+    // make sure we do not go beyond the end of the x grid: valgrind will yell at you
+    auto next = std::next( xIter );
+    if ( next < x.end() ) {
+
+      if ( *std::next( xIter ) == *xIter ) {
+
+        Log::error( "An x value can only be repeated a maximum of two times" );
+        Log::info( "x = {} is present at least three times", *xIter );
+        throw std::exception();
+      }
     }
     xIter = std::adjacent_find( xIter, x.end() );
   }