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-rw-r--r--src/lib/hexstrtobin.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/hexstrtobin.c b/src/lib/hexstrtobin.c
index ed2abc4e8b..61290b86d3 100644
--- a/src/lib/hexstrtobin.c
+++ b/src/lib/hexstrtobin.c
@@ -11,6 +11,7 @@
* GNU General Public License for more details.
*/
+#include <ctype.h>
#include <lib.h>
#include <string.h>