2 files changed, 2 insertions, 2 deletions
diff --git a/src/graph/viewman/fun2D.c b/src/graph/viewman/fun2D.c
index 02810ffe..d3948b6b 100644
--- a/src/graph/viewman/fun2D.c
+++ b/src/graph/viewman/fun2D.c
@@ -224,7 +224,7 @@ forkView2D(void)
 #endif
     sprintf(envAXIOM,"%s",oa_getenv("AXIOM"));
     sprintf(runView,"%s%s",envAXIOM,"/lib/view2D");
-    check(execl(runView,runView,NULL));
+    check(execl(runView,runView, (char*) NULL));
     fprintf(stderr,"The viewport manager could not execute view2D.\nCheck that view2D is on your PATH.\n");
     exit(-1);
 
diff --git a/src/graph/viewman/fun3D.c b/src/graph/viewman/fun3D.c
index a0ced1b6..177aece1 100644
--- a/src/graph/viewman/fun3D.c
+++ b/src/graph/viewman/fun3D.c
@@ -276,7 +276,7 @@ forkView3D(int typeOfViewport)
 #endif
     sprintf(envAXIOM,"%s",oa_getenv("AXIOM"));
     sprintf(runView,"%s%s",envAXIOM,"/lib/view3D");
-    check(execl(runView,runView,NULL));
+    check(execl(runView,runView, (char*) NULL));
     fprintf(stderr,"The viewport manager could not execute view3D.\nCheck that view3D is on your PATH.\n");
     exit(-1);