diff --git a/ANNOUNCE b/ANNOUNCE
index 6c59bf246..279d712a6 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -98,6 +98,7 @@ Version 1.5.3beta05 [May 6, 2011]
     libpng would ignore an error at the end of the stream.
 
 Version 1.5.3beta06 [May 6, 2011]
+  Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
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diff --git a/CHANGES b/CHANGES
index ba995d700..0c5146bba 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3357,6 +3357,7 @@ Version 1.5.3beta05 [May 6, 2011]
     libpng would ignore an error at the end of the stream.
 
 Version 1.5.3beta06 [May 6, 2011]
+  Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4a6795725..6e4304a02 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -147,10 +147,6 @@ set(pngtest_sources
 
 add_definitions(-DPNG_CONFIGURE_LIBPNG)
 
-if(_AIX)
-  add_definitions(-D_ALL_SOURCE)
-endif(_AIX)
-
 if(MSVC)
   add_definitions(-DPNG_NO_MODULEDEF -D_CRT_SECURE_NO_DEPRECATE)
 endif(MSVC)