diff --git a/vpi/sys_display.c b/vpi/sys_display.c
index b145170e7..6799f42db 100644
--- a/vpi/sys_display.c
+++ b/vpi/sys_display.c
@@ -1235,12 +1235,12 @@ static PLI_INT32 sys_timeformat_compiletf(PLI_BYTE8*xx)
                         if (vpi_get(vpiType, tmp) != vpiConstant) {
                               vpi_printf("$timeformat's arguments must be");
                               vpi_printf(" constant.\n");
-                              vpi_control(vpiFinish, -1);
+                              vpi_control(vpiFinish, 1);
                         }
                   } else {
                         vpi_printf("$timeformat requires zero or four");
                         vpi_printf(" arguments!\n");
-                        vpi_control(vpiFinish, -1);
+                        vpi_control(vpiFinish, 1);
                         return 0;
                   }
             }
diff --git a/vpi/sys_fileio.c b/vpi/sys_fileio.c
index ff1fe7f5e..9e9304e12 100644
--- a/vpi/sys_fileio.c
+++ b/vpi/sys_fileio.c
@@ -41,14 +41,14 @@ static PLI_INT32 sys_fopen_compiletf(PLI_BYTE8*name)
 
       if (argv == 0) {
 	    vpi_printf("%s: file name argument missing.\n", name);
-	    vpi_control(vpiFinish, -1);
+	    vpi_control(vpiFinish, 1);
 	    return -1;
       }
 
       item = vpi_scan(argv);
       if (item == 0) {
 	    vpi_printf("%s: file name argument missing.\n", name);
-	    vpi_control(vpiFinish, -1);
+	    vpi_control(vpiFinish, 1);
 	    return -1;
       }
 
@@ -62,12 +62,12 @@ static PLI_INT32 sys_fopen_compiletf(PLI_BYTE8*name)
 
       if (! is_constant(item)) {
 	    vpi_printf("ERROR: %s mode argument must be a constant\n", name);
-	    vpi_control(vpiFinish, -1);
+	    vpi_control(vpiFinish, 1);
       }
 
       if (vpi_get(vpiConstType, item) != vpiStringConst) {
 	    vpi_printf("ERROR: %s mode argument must be a string.\n", name);
-	    vpi_control(vpiFinish, -1);
+	    vpi_control(vpiFinish, 1);
       }
  
       item = vpi_scan(argv);