diff --git a/bdftruncate.c b/bdftruncate.c
index 815d2ef..d344ef2 100644
--- a/bdftruncate.c
+++ b/bdftruncate.c
@@ -42,7 +42,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-
+#if defined(_MSC_VER)
+# if defined(_M_X64) || defined(_M_ARM64)
+#  define SSIZE_MAX LLONG_MAX
+# else
+#  define SSIZE_MAX LONG_MAX
+# endif
+#endif
 #ifndef __has_attribute
 # define __has_attribute(x) 0  /* Compatibility with older compilers. */
 #endif
diff --git a/ucs2any.c b/ucs2any.c
index 33c018d..c673197 100644
--- a/ucs2any.c
+++ b/ucs2any.c
@@ -51,7 +51,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 /* global variable for argv[0] */
 static const char *my_name = NULL;