Index: trunk/psLib/src/imageops/psImageConvolve.c
===================================================================
--- trunk/psLib/src/imageops/psImageConvolve.c	(revision 28043)
+++ trunk/psLib/src/imageops/psImageConvolve.c	(revision 28136)
@@ -1736,4 +1736,5 @@
         psThreadTaskRemove("PSLIB_IMAGE_SMOOTHMASK_SCANROWS");
         psThreadTaskRemove("PSLIB_IMAGE_SMOOTHMASK_SCANCOLS");
+        psThreadTaskRemove("PSLIB_IMAGE_SMOOTHMASK_PIXELS");
     }
     threaded = set;