diff --git a/src/google/protobuf/compiler/js/embed.cc b/src/google/protobuf/compiler/js/embed.cc
index 072cccad27..5d7163fa3e 100644
--- a/src/google/protobuf/compiler/js/embed.cc
+++ b/src/google/protobuf/compiler/js/embed.cc
@@ -28,6 +28,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include <cassert>
 #include <cstdlib>
 #include <fstream>
 #include <iostream>