diff --git a/ChangeLog b/ChangeLog
index d27b703bc0..ea36d0b5db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2004-12-16  Bill Skaggs <weskaggs@primate.ucdavis.edu>
+
+	* plug-ins/script-fu/scripts/circuit.scm: don't try to
+	desaturate a grayscale layer, fixes bug #161470.
+
 2004-12-16  Sven Neumann  <sven@gimp.org>
 
 	* app/config/gimpconfig-dump.c
diff --git a/plug-ins/script-fu/scripts/circuit.scm b/plug-ins/script-fu/scripts/circuit.scm
index b1a0c1bd5f..29e44e252b 100644
--- a/plug-ins/script-fu/scripts/circuit.scm
+++ b/plug-ins/script-fu/scripts/circuit.scm
@@ -96,7 +96,8 @@
     (plug-in-maze 1 image active-layer 5 5 TRUE 0 seed 57 1)
     (plug-in-oilify 1 image active-layer mask-size 0)
     (plug-in-edge 1 image active-layer 2 1 0)
-    (gimp-desaturate active-layer)
+    (if (= type RGBA-IMAGE)
+      (gimp-desaturate active-layer))
     
     (if (and
 	 (= remove-bg TRUE)