diff --git a/plugin/sdf/sdf.cc b/plugin/sdf/sdf.cc
index 87375ba3..2f3d565c 100644
--- a/plugin/sdf/sdf.cc
+++ b/plugin/sdf/sdf.cc
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <algorithm>
 #include <cstddef>
 #include <string>