diff --git a/bdftruncate.c b/bdftruncate.c
index 2b317c0b0..3ab84978f 100644
--- a/bdftruncate.c	
+++ b/bdftruncate.c
@@ -40,7 +40,13 @@
 #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
 #if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205))	\
         || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
 # define ATTR_NORETURN __attribute((noreturn))
diff --git a/ucs2any.c b/ucs2any.c
index 1f575d14f..75b662b3d 100644
--- a/ucs2any.c	
+++ b/ucs2any.c
@@ -49,7 +49,9 @@
 #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;