diff --git a/src/pngchunk.cpp b/src/pngchunk.cpp
index ba2469c9..66cd6b07 100644
--- a/src/pngchunk.cpp
+++ b/src/pngchunk.cpp
@@ -36,7 +36,7 @@ EXIV2_RCSID("@(#) $Id: pngchunk.cpp 823 2006-06-23 07:35:00Z cgilles $");
 # include "exv_conf.h"
 #endif
 
-#define DEBUG 1
+//#define DEBUG 1
 
 // some defines to make it easier
 #define PNG_CHUNK_TYPE(data, index)  &data[index+4]
diff --git a/src/pngimage.cpp b/src/pngimage.cpp
index 532c9eb1..50dc1798 100644
--- a/src/pngimage.cpp
+++ b/src/pngimage.cpp
@@ -30,7 +30,7 @@ EXIV2_RCSID("@(#) $Id: pngimage.cpp 823 2006-06-12 07:35:00Z cgilles $");
 
 // *****************************************************************************
 
-#define DEBUG 1
+//#define DEBUG 1
 
 // *****************************************************************************
 // included header files