diff --git a/ext/RMagick/rmagick_config.h.in b/ext/RMagick/rmagick_config.h.in
index aaae28980..209a6b11b 100644
--- a/ext/RMagick/rmagick_config.h.in
+++ b/ext/RMagick/rmagick_config.h.in
@@ -19,8 +19,6 @@
 #undef HAVE_BILEVELIMAGECHANNEL
 /* Introduced in IM 5.5.7, GM 1.1 */
 #undef HAVE_BLACKTHRESHOLDIMAGE
-/* Not available in GM */
-#undef HAVE_BLENDCOMPOSITEOP
 /* Introduced in IM 6.0.1 */
 #undef HAVE_BLURIMAGECHANNEL
 /* Introduced in IM 6.2.7 */
@@ -130,6 +128,8 @@
 #undef HAVE_IMAGE_TICKS_PER_SECOND
 /* Introduced in IM 6.2.9 */
 #undef HAVE_IMAGE_TRANSPARENT_COLOR
+/* Introduced in IM 6.2.0? */
+#undef HAVE_IMAGEINFO_CHANNEL
 /* Introduced in IM 5.5.7, GM 1.1 */
 #undef HAVE_IMPORTIMAGEPIXELS
 /* Introduced in IM 6.2.6-1 */