diff --git a/code/StringUtils.h b/code/StringUtils.h
index b2190c5a9..64f66e6b9 100644
--- a/code/StringUtils.h
+++ b/code/StringUtils.h
@@ -43,6 +43,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <sstream>
 #include <stdarg.h>
+#include <cstdlib>
 
 ///	@fn		ai_snprintf
 ///	@brief	The portable version of the function snprintf ( C99 standard ), which works on visual studio compilers 2013 and earlier.