diff --git a/ANNOUNCE b/ANNOUNCE
index 0b71fda96..dc902a384 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -71,6 +71,7 @@ version 1.5.0beta09 [February 19, 2010]
 
 version 1.5.0beta10 [February 22, 2010]
   Removed unused gzio.c from contrib/pngminim gather and makefile scripts
+  Revised png_longjmp() calls in contrib/gregbook to use png_ptr
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/CHANGES b/CHANGES
index c690944b1..087f99f4a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2548,6 +2548,7 @@ version 1.5.0beta09 [February 19, 2010]
 
 version 1.5.0beta10 [February 22, 2010]
   Removed unused gzio.c from contrib/pngminim gather and makefile scripts
+  Revised png_longjmp() calls in contrib/gregbook to use png_ptr
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/gregbook/readpng2.c b/contrib/gregbook/readpng2.c
index 5dd6d7c4f..f127ef58c 100644
--- a/contrib/gregbook/readpng2.c
+++ b/contrib/gregbook/readpng2.c
@@ -480,5 +480,5 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
         exit(99);
     }
 
-    png_longjmp(mainprog_ptr, 1);
+    png_longjmp(png_ptr, 1);
 }
diff --git a/contrib/gregbook/writepng.c b/contrib/gregbook/writepng.c
index 7b32aad68..2b0e98c3b 100644
--- a/contrib/gregbook/writepng.c
+++ b/contrib/gregbook/writepng.c
@@ -388,5 +388,5 @@ static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)
         exit(99);
     }
 
-    png_longjmp(mainprog_ptr, 1);
+    png_longjmp(png_ptr, 1);
 }