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-rw-r--r--tools/gpg-card.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/gpg-card.c b/tools/gpg-card.c
index d9d626c..07e9232 100644
--- a/tools/gpg-card.c
+++ b/tools/gpg-card.c
@@ -22,6 +22,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <ctype.h>
#ifdef HAVE_LIBREADLINE
# define GNUPG_LIBREADLINE_H_INCLUDED
# include <readline/readline.h>