diff --git a/ANNOUNCE b/ANNOUNCE
index 7e7948786aec405f733aebd4d1a56d4e71c996a9..99b0c50f2601085fa1fe889922d2751b9c5cc41b 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -103,6 +103,7 @@ Version 1.5.6rc03 [October 28, 2011]
     enables that fix for all compilers when using compile-time constants.
     Under MSYS 'byte' is a name declared in a system header file, so we
     changed the name of a local variable to avoid the warnings that result.
+  Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
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diff --git a/CHANGES b/CHANGES
index 4d5aa2ce8c5a015b355906b478202e8bf5728bb5..0f8d8b619af782cb1a68ee6c278576f13b586e95 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3664,6 +3664,7 @@ Version 1.5.6rc03 [October 28, 2011]
     enables that fix for all compilers when using compile-time constants.
     Under MSYS 'byte' is a name declared in a system header file, so we
     changed the name of a local variable to avoid the warnings that result.
+  Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/pngminim/decoder/pngusr.h b/contrib/pngminim/decoder/pngusr.h
index ce855375289a34d431b99efb36a3d72ed796aea8..9d9c50c4078a4c8c3ae5a51fa1c306f20daf6c42 100644
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -19,5 +19,6 @@
  */
 
 #define PNG_NO_WARNINGS
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
 
 #endif /* MINRDPNGCONF_H */
diff --git a/contrib/pngminim/encoder/pngusr.h b/contrib/pngminim/encoder/pngusr.h
index fb35245ee5ddd50b46143f58a0c633fbe8654b23..2033aadb20012b7fd5566bb673eaede3dc947349 100644
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -19,5 +19,6 @@
  */
 
 #define PNG_NO_WARNINGS
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
 
 #endif /* MINWRPNGCONF_H */
diff --git a/contrib/pngminim/preader/pngusr.h b/contrib/pngminim/preader/pngusr.h
index b40cc46ce69b61ecda254acc6899cefcb4a65a8c..73cfecfbf0680da29e36c06959b14d7161538297 100644
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -19,5 +19,6 @@
  */
 
 #define PNG_NO_WARNINGS
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
 
 #endif /* MINPRDPNGCONF_H */