diff --git a/ChangeLog b/ChangeLog
index 48349f98..5f65d583 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -54,6 +54,8 @@
 - meta, header, callback, error, REGION gtkdocs
 - removed printlines tool, vips2csv is much better
 - removed other useless tools as well: debugim, binfile
+- fix up addr calcs on 64-bit machines with >2gb images and inplace ops
+  (thanks Christoph)
 
 25/3/09 started 7.18.0
 - revised version numbers
diff --git a/libvips/include/vips/image.h b/libvips/include/vips/image.h
index fb28395f..88805daa 100644
--- a/libvips/include/vips/image.h
+++ b/libvips/include/vips/image.h
@@ -228,11 +228,14 @@ typedef struct _VipsImage {
 /* Pixel address calculation macros.
  */
 
-#define IM_IMAGE_SIZEOF_ELEMENT(I)	((I)->Bbits >> 3)
-#define IM_IMAGE_SIZEOF_PEL(I) 	\
-	(IM_IMAGE_SIZEOF_ELEMENT(I) * (I)->Bands)
-#define IM_IMAGE_SIZEOF_LINE(I) 	(IM_IMAGE_SIZEOF_PEL(I) * (I)->Xsize)
-#define IM_IMAGE_N_ELEMENTS(I)		((I)->Bands * (I)->Xsize)
+#define IM_IMAGE_SIZEOF_ELEMENT(I) \
+	((size_t)((I)->Bbits >> 3))
+#define IM_IMAGE_SIZEOF_PEL(I) \
+	((size_t)(IM_IMAGE_SIZEOF_ELEMENT(I) * (I)->Bands))
+#define IM_IMAGE_SIZEOF_LINE(I) \
+	((size_t)(IM_IMAGE_SIZEOF_PEL(I) * (I)->Xsize))
+#define IM_IMAGE_N_ELEMENTS(I) \
+	((size_t)((I)->Bands * (I)->Xsize))
 
 /* If DEBUG is defined, add bounds checking.
  */
@@ -240,7 +243,8 @@ typedef struct _VipsImage {
 #define IM_IMAGE_ADDR(I,X,Y) \
 	( ((X) >= 0 && (X) < (I)->Xsize && \
 	   (Y) >= 0 && (Y) < (I)->Ysize) ? \
-	     ((I)->data + (Y) * IM_IMAGE_SIZEOF_LINE(I) + \
+	     ((I)->data + \
+	       (Y) * IM_IMAGE_SIZEOF_LINE(I) + \
 	       (X) * IM_IMAGE_SIZEOF_PEL(I)) : \
 	     (fprintf( stderr, \
 		"IM_IMAGE_ADDR: point out of bounds, " \
diff --git a/libvips/include/vips/region.h b/libvips/include/vips/region.h
index 4df613a7..61f7d6d9 100644
--- a/libvips/include/vips/region.h
+++ b/libvips/include/vips/region.h
@@ -131,18 +131,20 @@ int im_wrapmany( IMAGE **in, IMAGE *out,
  *	IM_REGION_SIZEOF_LINE()		sizeof width of region
  *	IM_REGION_ADDR()		address of pixel in region
  */
-#define IM_REGION_LSKIP(R) ((R)->bpl)
-#define IM_REGION_N_ELEMENTS(R) ((R)->valid.width*(R)->im->Bands)
+#define IM_REGION_LSKIP(R) \
+	((size_t)((R)->bpl))
+#define IM_REGION_N_ELEMENTS(R) \
+	((size_t)((R)->valid.width * (R)->im->Bands))
 #define IM_REGION_SIZEOF_LINE(R) \
-	((R)->valid.width * IM_IMAGE_SIZEOF_PEL((R)->im))
+	((size_t)((R)->valid.width * IM_IMAGE_SIZEOF_PEL((R)->im)))
 
 /* If DEBUG is defined, add bounds checking.
  */
 #ifdef DEBUG
 #define IM_REGION_ADDR(B,X,Y) \
 	( (im_rect_includespoint( &(B)->valid, (X), (Y) ))? \
-	  ((B)->data + ((Y) - (B)->valid.top)*IM_REGION_LSKIP(B) + \
-	  ((X) - (B)->valid.left)*IM_IMAGE_SIZEOF_PEL((B)->im)): \
+	  ((B)->data + ((Y) - (B)->valid.top) * IM_REGION_LSKIP(B) + \
+	  ((X) - (B)->valid.left) * IM_IMAGE_SIZEOF_PEL((B)->im)): \
 	  (fprintf( stderr, \
 		"IM_REGION_ADDR: point out of bounds, " \
 		"file \"%s\", line %d\n" \
diff --git a/libvips/iofuncs/im_open_vips.c b/libvips/iofuncs/im_open_vips.c
index 623ca25b..4caebdff 100644
--- a/libvips/iofuncs/im_open_vips.c
+++ b/libvips/iofuncs/im_open_vips.c
@@ -228,7 +228,7 @@
  * IM_IMAGE_N_ELEMENTS:
  * @I: a #VipsImage
  *
- * Returns: the number of band elements in a scanline.
+ * Returns: The number of band elements in a scanline.
  */
 
 /**
@@ -243,7 +243,7 @@
  * 
  * If DEBUG is defined, you get a version that checks bounds for you.
  *
- * Returns: the address of pixel (x,y) in the image.
+ * Returns: The address of pixel (x,y) in the image.
  */
 
 /** 
diff --git a/libvips/iofuncs/region.c b/libvips/iofuncs/region.c
index d2084bdb..1a10e15b 100644
--- a/libvips/iofuncs/region.c
+++ b/libvips/iofuncs/region.c
@@ -132,21 +132,21 @@
  * IM_REGION_LSKIP:
  * @R: a #REGION
  *
- * Returns: the number of bytes to add to move down a scanline.
+ * Returns: The number of bytes to add to move down a scanline.
  */
 
 /**
  * IM_REGION_N_ELEMENTS:
  * @R: a #REGION
  *
- * Returns: the number of band elements across a region.
+ * Returns: The number of band elements across a region.
  */
 
 /**
  * IM_REGION_SIZEOF_LINE:
  * @R: a #REGION
  *
- * Returns: the number of bytes across a region.
+ * Returns: The number of bytes across a region.
  */
 
 /**
@@ -160,7 +160,7 @@
  * 
  * If DEBUG is defined, you get a version that checks bounds for you.
  *
- * Returns: the address of pixel (x,y) in the region.
+ * Returns: The address of pixel (x,y) in the region.
  */
 
 /**
@@ -170,7 +170,7 @@
  * This macro returns a pointer to the top-left pixel in the #REGION, that is,
  * the pixel at (@R->valid.left, @R->valid.top).
  * 
- * Returns: the address of the top-left pixel in the region.
+ * Returns: The address of the top-left pixel in the region.
  */
 
 #ifdef DEBUG