diff --git a/libs/picomodel/lwo/lwo2.c b/libs/picomodel/lwo/lwo2.c
index ff83d5c22b..b3dbc68ebf 100644
--- a/libs/picomodel/lwo/lwo2.c
+++ b/libs/picomodel/lwo/lwo2.c
@@ -292,6 +292,9 @@ int lwValidateObject( char *filename, picoMemStream_t *fp, unsigned int *failID,
 
    if ( id != ID_FORM ) {
       if ( failpos ) *failpos = 12;
+      
+      formsize++; /* silence compiler warning about unused variable */
+          
       return PICO_PMV_ERROR_SIZE;
    }
 
diff --git a/libs/picomodel/lwo/lwob.c b/libs/picomodel/lwo/lwob.c
index 62ba161d84..348d3e5114 100644
--- a/libs/picomodel/lwo/lwob.c
+++ b/libs/picomodel/lwo/lwob.c
@@ -10,6 +10,7 @@ Ernie Wright  17 Sep 00
 
 #include "../picointernal.h"
 #include "lwo2.h"
+#include <stdint.h>
 
 /* disable warnings */
 #ifdef WIN32
@@ -550,7 +551,7 @@ int lwGetPolygons5( picoMemStream_t *fp, int cksize, lwPolygonList *plist, int p
          bp += 2;
       }
       j -= 1;
-      pp->surf = ( lwSurface * ) j;
+      pp->surf = ( lwSurface * ) (intptr_t) j;
 
       pp++;
       pv += nv;
@@ -720,6 +721,7 @@ int lwValidateObject5( char *filename, picoMemStream_t *fp, unsigned int *failID
 
    if ( id != ID_FORM || type != ID_LWOB ) {
       if ( failpos ) *failpos = 12;
+      formsize++; /* silence compiler warning about unused variable */
       return PICO_PMV_ERROR_IDENT;
    }
 
diff --git a/libs/picomodel/lwo/pntspols.c b/libs/picomodel/lwo/pntspols.c
index a7f54d251f..784f1b4d2f 100644
--- a/libs/picomodel/lwo/pntspols.c
+++ b/libs/picomodel/lwo/pntspols.c
@@ -9,7 +9,7 @@ Ernie Wright  17 Sep 00
 
 #include "../picointernal.h"
 #include "lwo2.h"
-
+#include <stdint.h>
 
 /*
 ======================================================================
@@ -334,7 +334,8 @@ int lwResolvePolySurfaces( lwPolygonList *polygon, lwTagList *tlist,
    lwSurface **surf, int *nsurfs )
 {
    lwSurface **s, *st;
-   int i, index;
+   int i;
+   intptr_t index;
 
    if ( tlist->count == 0 ) return 1;
 
@@ -353,7 +354,7 @@ int lwResolvePolySurfaces( lwPolygonList *polygon, lwTagList *tlist,
    }
 
    for ( i = 0; i < polygon->count; i++ ) {
-      index = ( int ) polygon->pol[ i ].surf;
+      index = ( intptr_t ) polygon->pol[ i ].surf;
       if ( index < 0 || index > tlist->count ) return 0;
       if ( !s[ index ] ) {
          s[ index ] = lwDefaultSurface();
@@ -525,9 +526,9 @@ int lwGetPolygonTags( picoMemStream_t *fp, int cksize, lwTagList *tlist,
       j = getVX( fp ) + tlist->offset;
       rlen = get_flen();
       if ( rlen < 0 || rlen > cksize ) return 0;
-
+    
       switch ( type ) {
-         case ID_SURF:  plist->pol[ i ].surf = ( lwSurface * ) j;  break;
+         case ID_SURF:  plist->pol[ i ].surf = ( lwSurface * ) (intptr_t) j;  break;
          case ID_PART:  plist->pol[ i ].part = j;  break;
          case ID_SMGP:  plist->pol[ i ].smoothgrp = j;  break;
       }