1 files changed, 5 insertions, 0 deletions
diff --git a/src/build_log.h b/src/build_log.h
index be12d85..a671467 100644
--- a/src/build_log.h
+++ b/src/build_log.h
@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#ifndef NINJA_BUILD_LOG_H_
+#define NINJA_BUILD_LOG_H_
+
 #include <map>
 #include <string>
 using namespace std;
@@ -61,3 +64,5 @@ struct BuildLog {
   BuildConfig* config_;
   bool needs_recompaction_;
 };
+
+#endif // NINJA_BUILD_LOG_H_