diff --git a/source/exhumed/src/trigdat.cpp b/source/exhumed/src/trigdat.cpp
index c0cf59531..7c3bd539b 100644
--- a/source/exhumed/src/trigdat.cpp
+++ b/source/exhumed/src/trigdat.cpp
@@ -18,6 +18,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "ns.h"
 #include "trigdat.h"
 #ifndef __WATCOMC__
+#include <cstdlib>
 #include <cmath>
 #else
 #include <stdlib.h>