diff --git a/ColorHug-sensor-driver.patch b/ColorHug-sensor-driver.patch
index 587e074..6969178 100644
--- a/ColorHug-sensor-driver.patch
+++ b/ColorHug-sensor-driver.patch
@@ -304,7 +304,7 @@ diff -wruN ../orig-Argyll_V1.3.5/spectro/colorhug.c ./spectro/colorhug.c
 +}
 +
 +/* Converts a packed float to a double */
-+static double packed_float_to_double (uint32_t pf)
++static double packed_float_to_double (int32_t pf)
 +{
 +	return (double) pf / (double) 0x10000;
 +}
diff --git a/argyllcms.changes b/argyllcms.changes
index 49bf23c..f54c409 100644
--- a/argyllcms.changes
+++ b/argyllcms.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Jan 23 10:50:19 UTC 2012 - kkaempf@suse.com
+
+- ColorHug-sensor-driver.patch: Fix function declaration to improve
+  detection of 'perfect black' (via colorhug-users@googlegroups.com)
+
 -------------------------------------------------------------------
 Thu Jan 19 15:24:23 UTC 2012 - fcrozat@suse.com