diff --git a/DESCRIPTION b/DESCRIPTION
index 2627786..783a71f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: spatstat.geom
-Version: 3.2-7.001
-Date: 2023-12-08
+Version: 3.2-7.002
+Date: 2023-12-16
 Title: Geometrical Functionality of the 'spatstat' Family 
 Authors@R: c(person("Adrian", "Baddeley", 
                     role = c("aut", "cre", "cph"),
diff --git a/NEWS b/NEWS
index 42fde28..7d74e88 100644
--- a/NEWS
+++ b/NEWS
@@ -1,8 +1,15 @@
-        CHANGES IN spatstat.geom VERSION 3.2-7.001
+        CHANGES IN spatstat.geom VERSION 3.2-7.002
 
 OVERVIEW
 
-    o Internal improvements.
+    o Minor improvements.
+
+SIGNIFICANT USER-VISIBLE CHANGES
+
+    o is.subset.owin
+    Algorithm slightly modified to give better results when
+    the two polygons share some common edges.
+
 
         CHANGES IN spatstat.geom VERSION 3.2-7
 
diff --git a/R/is.subset.owin.R b/R/is.subset.owin.R
index 5d127ca..9833756 100644
--- a/R/is.subset.owin.R
+++ b/R/is.subset.owin.R
@@ -1,7 +1,7 @@
 #
 #  is.subset.owin.R
 #
-#  $Revision: 1.16 $   $Date: 2019/03/01 06:02:27 $
+#  $Revision: 1.17 $   $Date: 2023/12/16 05:02:18 $
 #
 #  Determine whether a window is a subset of another window
 #
@@ -52,17 +52,17 @@ is.subset.owin <- local({
         return(FALSE)
       ## all vertices of A are inside B.
       if(is.convex(B)) return(TRUE)
-      ## check for boundary crossings
-      bx <- crossing.psp(edges(A), edges(B))
-      if(npoints(bx) > 0) return(FALSE)
-      ## Absence of boundary crossings is sufficient if B has no holes
-      if(length(B$bdry) == 1 || !any(sapply(B$bdry, is.hole.xypolygon)))
-        return(TRUE)
-      ## Compare area of intersection with area of putative subset
-      ## (these are subject to numerical rounding error)
-      areaA <- area(A)
-      if(overlap.owin(A,B) >= areaA ||
-         overlap.owin(B,A) >= areaA) return(TRUE)
+      ## check whether the boundaries are disjoint
+      if(!anycrossing.psp(edges(A), edges(B))) {
+        ## Disjoint boundary crossings sufficient if B has no holes
+        if(length(B$bdry) == 1 || !any(sapply(B$bdry, is.hole.xypolygon)))
+          return(TRUE)
+        ## Compare area of intersection with area of putative subset
+        ## (use '>=' instead of '==' because of numerical rounding error)
+        areaA <- area(A)
+        if(overlap.owin(A,B) >= areaA ||
+           overlap.owin(B,A) >= areaA) return(TRUE)
+      }
       ## continue...
     }
   
diff --git a/inst/doc/packagesizes.txt b/inst/doc/packagesizes.txt
index ddd3f1a..ebdd9ab 100755
--- a/inst/doc/packagesizes.txt
+++ b/inst/doc/packagesizes.txt
@@ -24,4 +24,4 @@ date version nhelpfiles nobjects ndatasets Rlines srclines
 "2023-09-05" "3.2-5" 450 1203 0 35948 15822
 "2023-10-19" "3.2-6" 451 1203 0 35983 15822
 "2023-10-20" "3.2-7" 451 1203 0 35983 15822
-"2023-12-08" "3.2-7.001" 452 1203 0 36031 15822
+"2023-12-16" "3.2-7.002" 452 1203 0 36031 15822