diff --git a/media/libpng/MOZCHANGES b/media/libpng/MOZCHANGES
index ace211a6b49..ff6f5e007a9 100644
--- a/media/libpng/MOZCHANGES
+++ b/media/libpng/MOZCHANGES
@@ -1,6 +1,10 @@
 
 Changes made to pristine png source by mozilla.org developers.
 
+2012/07/04  -- Disabled TEXT support in mozpngconf.h.
+
+2012/10/02  -- Synced with libpng-1.5.13 (bug #775662).
+
 2012/07/16  -- Add an "APNG-aware app" flag (bug #759067).
 
 2012/07/04  -- Synced with libpng-1.5.11 (bug #771394).
diff --git a/media/libpng/mozpngconf.h b/media/libpng/mozpngconf.h
index 65b771d0563..bbb3bbb6a47 100644
--- a/media/libpng/mozpngconf.h
+++ b/media/libpng/mozpngconf.h
@@ -9,6 +9,7 @@
 #define PNG_COST_SHIFT 3
 #define PNG_GAMMA_THRESHOLD_FIXED 5000
 #define PNG_MAX_GAMMA_8 11
+#define PNG_USER_CHUNK_CACHE_MAX 128
 #define PNG_USER_CHUNK_MALLOC_MAX 4000000L
 #define PNG_USER_HEIGHT_MAX 1000000
 #define PNG_USER_WIDTH_MAX 1000000
@@ -39,7 +40,6 @@
 #define PNG_READ_GRAY_TO_RGB_SUPPORTED
 #define PNG_READ_INTERLACING_SUPPORTED
 #define PNG_READ_SCALE_16_TO_8_SUPPORTED
-#define PNG_READ_TEXT_SUPPORTED
 #define PNG_READ_TRANSFORMS_SUPPORTED
 #endif