diff --git a/include/algorithms/public/DCT.hpp b/include/algorithms/public/DCT.hpp
index 1cde59292..f53ae8264 100644
--- a/include/algorithms/public/DCT.hpp
+++ b/include/algorithms/public/DCT.hpp
@@ -41,6 +41,11 @@ class DCT
     assert(inputSize <= mTable.cols());
     assert(outputSize <= mTable.rows());
 
+    // Do not reinitialise if there is no need
+      
+    if (mInitialized && mInputSize == inputSize && mOutputSize == outputSize)
+      return;
+      
     mInputSize = inputSize;
     mOutputSize = outputSize;
     mTable.setZero();