diff --git a/exa/exa.c b/exa/exa.c
index 4b96af8..0676838 100644
--- a/exa/exa.c
+++ b/exa/exa.c
@@ -204,7 +204,7 @@ exaCreatePixmap(ScreenPtr pScreen, int w
 
     pExaPixmap->fb_ptr = NULL;
     if (pExaScr->info->flags & EXA_OFFSCREEN_ALIGN_POT && w != 1)
-	pExaPixmap->fb_pitch = (1 << (exaLog2(w - 1) + 1)) * bpp / 8;
+	pExaPixmap->fb_pitch = (w != 0) ? (1 << (exaLog2(w - 1) + 1)) * bpp / 8 : 0;
     else
 	pExaPixmap->fb_pitch = w * bpp / 8;
     pExaPixmap->fb_pitch = EXA_ALIGN(pExaPixmap->fb_pitch,