diff --git a/src/matrix_col.rs b/src/matrix_col.rs
index 570e0dc..15456c9 100644
--- a/src/matrix_col.rs
+++ b/src/matrix_col.rs
@@ -7,7 +7,7 @@ use std::os::raw::c_int;
 use crate::Problem;
 
 /// Represents a constraint
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct Row(pub(crate) c_int);
 
 /// A constraint matrix to build column-by-column
diff --git a/src/matrix_row.rs b/src/matrix_row.rs
index 6f27fd3..58866c0 100644
--- a/src/matrix_row.rs
+++ b/src/matrix_row.rs
@@ -8,7 +8,7 @@ use crate::matrix_col::ColMatrix;
 use crate::Problem;
 
 /// Represents a variable
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct Col(pub(crate) usize);
 
 /// A complete optimization problem stored by row