1 files changed, 4 insertions, 0 deletions
diff --git a/minctest.h b/minctest.h
index 260b36e..0438c9c 100644
--- a/minctest.h
+++ b/minctest.h
@@ -15,6 +15,9 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#ifndef MINCTEST_MINCTEST_H
+#define MINCTEST_MINCTEST_H
+
 #include <inttypes.h>
 #include <stdbool.h>
 
@@ -76,3 +79,4 @@ void test_exit(tester*);
  */
 void test_true(tester* tester, bool check, const char* text);
 
+#endif // MINCTEST_MINCTEST_H