diff --git a/src/strcmp.c b/src/strcmp.c
index f3dc25f..07919d5 100644
--- a/src/strcmp.c
+++ b/src/strcmp.c
@@ -16,20 +16,28 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see https://www.gnu.org/licenses/.
  */
-#include <stdio.h> /* fprintf(3), stderr */
-#include <sysexits.h> /* EX_OK, EX_USAGE */
+#include <stdio.h> /* fprintf(3), perror(3), stderr */
+#include <sysexits.h> /* EX_OK, EX_OSERR, EX_USAGE */
+
+#ifdef __OpenBSD__
+#	include <unistd.h> /* pledge(2) */
+#endif
 
 char *program_name = "strcmp";
 
 int main(int argc, char *argv[]) {
+	program_name = argv[0] == NULL ? program_name : argv[0];
 	int i;
 
+#ifdef __OpenBSD__
+	if (pledge("stdio", NULL) != -1) {
+		perror(program_name);
+		return EX_OSERR;
+	}
+#endif
+
 	if (argc < 3) {
-		(void)fprintf(
-			stderr,
-			"Usage: %s string string...\n",
-			argv[0] == NULL ? program_name : argv[0]
-		);
+		(void)fprintf(stderr, "Usage: %s string string...\n", program_name);
 
 		return EX_USAGE;
 	}