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-rw-r--r--lib/libc/gen/unvis.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/libc/gen/unvis.c b/lib/libc/gen/unvis.c
index ebeb771b235a..547048336c4d 100644
--- a/lib/libc/gen/unvis.c
+++ b/lib/libc/gen/unvis.c
@@ -36,6 +36,7 @@ static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
+#include <ctype.h>
#include <vis.h>
/*