diff --git a/src/common/windows/string_utils.cc b/src/common/windows/string_utils.cc
--- a/src/common/windows/string_utils.cc
+++ b/src/common/windows/string_utils.cc
@@ -27,6 +27,8 @@
 // (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 <stdlib.h>
+
 #include <cassert>
 #include <vector>