diff --git a/TODO b/TODO
index cbc44900..a082ccb5 100644
--- a/TODO
+++ b/TODO
@@ -5,9 +5,6 @@
 	#endif /*WITH_DMALLOC*/
 
 
-- (header -f height file.v) seems to segv?
-
-
 
 - do clip/embed etc. in new style, good to get everything that VipsAdd uses in
   the new stack
diff --git a/libvips/deprecated/wrapvips7.c b/libvips/deprecated/wrapvips7.c
index ed57d139..3ba82752 100644
--- a/libvips/deprecated/wrapvips7.c
+++ b/libvips/deprecated/wrapvips7.c
@@ -853,53 +853,3 @@ vips__init_wrap7_classes( void )
 	(void) im_map_packages( (VSListMap2Fn) vips_wrap7_build_package, NULL );
 }
 
-/* The vips7 malloc/free need to be thin wrappers over g_malloc()/g_free(),
- * since we pass strings to and from the library and need to be able to free
- * with either.
- */
-
-int
-im_free( void *s )
-{        
-	g_free( s );
-
-	return( 0 );
-}
-
-void *
-im_malloc( IMAGE *im, size_t size )
-{
-	void *buf;
-
-	if( !(buf = g_try_malloc( size )) ) {
-		im_error( "im_malloc",
-			_( "out of memory --- size == %dMB" ),
-			(int) (size / (1024.0*1024.0))  );
-		im_warn( "im_malloc",
-			_( "out of memory --- size == %dMB" ),
-			(int) (size / (1024.0*1024.0))  );
-		return( NULL );
-	}
-
-	if( im && im_add_close_callback( im,
-		(im_callback_fn) im_free, buf, NULL ) ) {
-		im_free( buf );
-		return( NULL );
-	}
-
-	return( buf );
-}
-
-char *
-im_strdup( IMAGE *im, const char *str )
-{
-	int l = strlen( str );
-	char *buf;
-
-	if( !(buf = (char *) im_malloc( im, l + 1 )) )
-		return( NULL );
-	strcpy( buf, str );
-
-	return( buf );
-}
-
diff --git a/libvips/include/vips/memory.h b/libvips/include/vips/memory.h
index 8f7efef8..da3f3b4c 100644
--- a/libvips/include/vips/memory.h
+++ b/libvips/include/vips/memory.h
@@ -65,7 +65,7 @@ G_STMT_START { \
 	((T *) vips_malloc( VIPS_OBJECT( OBJ ), (N) * sizeof( T )))
 
 void *vips_malloc( VipsObject *object, size_t size );
-char *vips_strdup( VipsObject *object, char *str );
+char *vips_strdup( VipsObject *object, const char *str );
 int vips_free( void *buf );
 
 void vips_tracked_free( void *s );
diff --git a/libvips/include/vips/vips7compat.h b/libvips/include/vips/vips7compat.h
index 6451029f..d7e8437f 100644
--- a/libvips/include/vips/vips7compat.h
+++ b/libvips/include/vips/vips7compat.h
@@ -285,12 +285,6 @@ int im_generate( VipsImage *im,
 #define im__print_renders vips__print_renders
 #define im_cache vips_image_cache
 
-/* vips_alloc() and friends are not the same, we need to keep these as C.
- */
-char *im_strdup( IMAGE *im, const char *str );
-int im_free( void *s );
-void *im_malloc( IMAGE *im, size_t size );
-
 #define IM_FREEF( F, S ) \
 G_STMT_START { \
         if( S ) { \
@@ -323,6 +317,11 @@ G_STMT_START { \
         } \
 } G_STMT_END
 
+#define im_malloc( IM, SZ ) \
+	(vips_malloc( VIPS_OBJECT( IM ), (SZ) ))
+#define im_free vips_free
+#define im_strdup( IM, STR ) \
+	(vips_strdup( VIPS_OBJECT( IM ), (STR) ))
 #define IM_NEW( IM, T ) ((T *) im_malloc( (IM), sizeof( T )))
 #define IM_ARRAY( IM, N, T ) ((T *) im_malloc( (IM), (N) * sizeof( T )))
 
diff --git a/libvips/iofuncs/image.c b/libvips/iofuncs/image.c
index 283886ae..ac8a1071 100644
--- a/libvips/iofuncs/image.c
+++ b/libvips/iofuncs/image.c
@@ -491,6 +491,7 @@ lazy_free_cb( VipsImage *image, Lazy *lazy )
 
 	g_free( lazy->filename );
 	VIPS_UNREF( lazy->real );
+	g_free( lazy );
 }
 
 static Lazy *
diff --git a/libvips/iofuncs/memory.c b/libvips/iofuncs/memory.c
index 690a57dd..95a1aeb4 100644
--- a/libvips/iofuncs/memory.c
+++ b/libvips/iofuncs/memory.c
@@ -171,7 +171,7 @@ vips_malloc( VipsObject *object, size_t size )
  * Returns: a pointer to the allocated memory
  */
 char *
-vips_strdup( VipsObject *object, char *str )
+vips_strdup( VipsObject *object, const char *str )
 {
 	char *str_dup;