From 2ca16ac3a575eec020563e95a3710092afd5bfd7 Mon Sep 17 00:00:00 2001
From: "Eric G. Kratz" <kratman@users.noreply.github.com>
Date: Thu, 3 Oct 2024 11:19:51 -0400
Subject: [PATCH] Fix a type issue for windows (#4486)

---
 src/pybamm/solvers/c_solvers/idaklu/observe.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/pybamm/solvers/c_solvers/idaklu/observe.hpp b/src/pybamm/solvers/c_solvers/idaklu/observe.hpp
index e8dc432240..52a0cfdf84 100644
--- a/src/pybamm/solvers/c_solvers/idaklu/observe.hpp
+++ b/src/pybamm/solvers/c_solvers/idaklu/observe.hpp
@@ -9,6 +9,11 @@
 #include <vector>
 using std::vector;
 
+#if defined(_MSC_VER)
+    #include <BaseTsd.h>
+    typedef SSIZE_T ssize_t;
+#endif
+
 /**
  * @brief Observe and Hermite interpolate ND variables
  */