diff --git a/_pyceres/helpers.h b/_pyceres/helpers.h
index 79f3fab..8fea333 100644
--- a/_pyceres/helpers.h
+++ b/_pyceres/helpers.h
@@ -13,12 +13,12 @@
 #include <pybind11/numpy.h>
 #include <pybind11/pybind11.h>
 
-+#ifdef _MSC_VER
-+#include <BaseTsd.h>
-+typedef SSIZE_T ssize_t;
-+#else
-+#include <unistd.h>
-+#endif
+#ifdef _MSC_VER
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#else
+#include <unistd.h>
+#endif
 
 using namespace pybind11::literals;
 namespace py = pybind11;