diff --git a/ortools/glop/markowitz.h b/ortools/glop/markowitz.h
index bd6b6d3007..fa7612710c 100644
--- a/ortools/glop/markowitz.h
+++ b/ortools/glop/markowitz.h
@@ -103,6 +103,10 @@ class MatrixNonZeroPattern {
  public:
   MatrixNonZeroPattern() = default;
 
+  // This type is neither copyable nor movable.
+  MatrixNonZeroPattern(const MatrixNonZeroPattern&) = delete;
+  MatrixNonZeroPattern& operator=(const MatrixNonZeroPattern&) = delete;
+
   // Releases the memory used by this class.
   void Clear();
 
@@ -197,8 +201,6 @@ class MatrixNonZeroPattern {
   DenseBooleanRow bool_scratchpad_;
   std::vector<ColIndex> col_scratchpad_;
   ColIndex num_non_deleted_columns_;
-
-  DISALLOW_COPY_AND_ASSIGN(MatrixNonZeroPattern);
 };
 
 // Adjustable priority queue of columns. Pop() returns a column with the
@@ -208,6 +210,10 @@ class ColumnPriorityQueue {
  public:
   ColumnPriorityQueue() = default;
 
+  // This type is neither copyable nor movable.
+  ColumnPriorityQueue(const ColumnPriorityQueue&) = delete;
+  ColumnPriorityQueue& operator=(const ColumnPriorityQueue&) = delete;
+
   // Releases the memory used by this class.
   void Clear();
 
@@ -229,7 +235,6 @@ class ColumnPriorityQueue {
   StrictITIVector<ColIndex, int32_t> col_degree_;
   std::vector<std::vector<ColIndex>> col_by_degree_;
   int32_t min_degree_;
-  DISALLOW_COPY_AND_ASSIGN(ColumnPriorityQueue);
 };
 
 // Contains a set of columns indexed by ColIndex. This is like a SparseMatrix
@@ -240,6 +245,12 @@ class SparseMatrixWithReusableColumnMemory {
  public:
   SparseMatrixWithReusableColumnMemory() = default;
 
+  // This type is neither copyable nor movable.
+  SparseMatrixWithReusableColumnMemory(
+      const SparseMatrixWithReusableColumnMemory&) = delete;
+  SparseMatrixWithReusableColumnMemory& operator=(
+      const SparseMatrixWithReusableColumnMemory&) = delete;
+
   // Resets the repository to num_cols empty columns.
   void Reset(ColIndex num_cols);
 
@@ -266,7 +277,6 @@ class SparseMatrixWithReusableColumnMemory {
   absl::StrongVector<ColIndex, int> mapping_;
   std::vector<int> free_columns_;
   std::vector<SparseColumn> columns_;
-  DISALLOW_COPY_AND_ASSIGN(SparseMatrixWithReusableColumnMemory);
 };
 
 // The class that computes either the actual L.U decomposition, or the
@@ -276,6 +286,10 @@ class Markowitz {
  public:
   Markowitz() = default;
 
+  // This type is neither copyable nor movable.
+  Markowitz(const Markowitz&) = delete;
+  Markowitz& operator=(const Markowitz&) = delete;
+
   // Computes the full factorization with P, Q, L and U.
   //
   // If the matrix is singular, the returned status will indicate it and the
@@ -448,8 +462,6 @@ class Markowitz {
 
   // Number of floating point operations of the last factorization.
   int64_t num_fp_operations_;
-
-  DISALLOW_COPY_AND_ASSIGN(Markowitz);
 };
 
 }  // namespace glop