diff --git a/pixman/pixman-bits-image.c b/pixman/pixman-bits-image.c
index 75a39a1..489ab16 100644
--- a/pixman/pixman-bits-image.c
+++ b/pixman/pixman-bits-image.c
@@ -199,7 +199,7 @@ bits_image_fetch_bilinear_no_repeat_8888 (pixman_iter_t *iter,
     }
     else
     {
-	top_row = bits->bits + y1 * bits->rowstride;
+	top_row = bits->bits + (size_t)y1 * bits->rowstride;
 	x_top = x;
 	ux_top = ux;
     }
@@ -212,7 +212,7 @@ bits_image_fetch_bilinear_no_repeat_8888 (pixman_iter_t *iter,
     }
     else
     {
-	bottom_row = bits->bits + y2 * bits->rowstride;
+	bottom_row = bits->bits + (size_t)y2 * bits->rowstride;
 	x_bottom = x;
 	ux_bottom = ux;
     }
@@ -822,7 +822,7 @@ bits_image_fetch_separable_convolution_affine (pixman_image_t * image,
 			    repeat (repeat_mode, &rx, bits->width);
 			    repeat (repeat_mode, &ry, bits->height);
 
-			    row = (uint8_t *)bits->bits + bits->rowstride * 4 * ry;
+			    row = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * ry;
 			    pixel = convert_pixel (row, rx) | mask;
 			}
 			else
@@ -833,7 +833,7 @@ bits_image_fetch_separable_convolution_affine (pixman_image_t * image,
 			    }
 			    else
 			    {
-				row = (uint8_t *)bits->bits + bits->rowstride * 4 * ry;
+				row = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * ry;
 				pixel = convert_pixel (row, rx) | mask;
 			    }
 			}
@@ -935,8 +935,8 @@ bits_image_fetch_bilinear_affine (pixman_image_t * image,
 	    repeat (repeat_mode, &x2, width);
 	    repeat (repeat_mode, &y2, height);
 
-	    row1 = (uint8_t *)bits->bits + bits->rowstride * 4 * y1;
-	    row2 = (uint8_t *)bits->bits + bits->rowstride * 4 * y2;
+	    row1 = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * y1;
+	    row2 = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * y2;
 
 	    tl = convert_pixel (row1, x1) | mask;
 	    tr = convert_pixel (row1, x2) | mask;
@@ -971,7 +971,7 @@ bits_image_fetch_bilinear_affine (pixman_image_t * image,
 	    }
 	    else
 	    {
-		row1 = (uint8_t *)bits->bits + bits->rowstride * 4 * y1;
+		row1 = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * y1;
 		row1 += bpp / 8 * x1;
 
 		mask1 = PIXMAN_FORMAT_A (format)? 0 : 0xff000000;
@@ -984,7 +984,7 @@ bits_image_fetch_bilinear_affine (pixman_image_t * image,
 	    }
 	    else
 	    {
-		row2 = (uint8_t *)bits->bits + bits->rowstride * 4 * y2;
+		row2 = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * y2;
 		row2 += bpp / 8 * x1;
 
 		mask2 = PIXMAN_FORMAT_A (format)? 0 : 0xff000000;
@@ -1082,7 +1082,7 @@ bits_image_fetch_nearest_affine (pixman_image_t * image,
 		repeat (repeat_mode, &y0, height);
 	    }
 
-	    row = (uint8_t *)bits->bits + bits->rowstride * 4 * y0;
+	    row = (uint8_t *)bits->bits + (size_t)bits->rowstride * 4 * y0;
 
 	    buffer[i] = convert_pixel (row, x0) | mask;
 	}
@@ -1695,7 +1695,7 @@ create_bits (pixman_format_code_t format,
     if (_pixman_multiply_overflows_size (height, stride))
 	return NULL;
 
-    buf_size = height * stride;
+    buf_size = (size_t)height * stride;
 
     if (rowstride_bytes)
 	*rowstride_bytes = stride;