diff --git a/osslsigncode.c b/osslsigncode.c
index 6711bb3..a1878b0 100644
--- a/osslsigncode.c
+++ b/osslsigncode.c
@@ -116,6 +116,14 @@ static const char *rcsid = "$Id: osslsigncode.c,v 1.7.1 2014/07/11 14:14:14 mfiv
 
 #endif
 
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
 #if defined (HAVE_TERMIOS_H) || defined (HAVE_GETPASS)
 #define PROVIDE_ASKPASS 1
 #endif