diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index 0ef17a33e9..5eb30a8815 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,3 +1,7 @@
+September 7, 2009  (Changes by Graf Zahl)
+- fixed: The PNG loader for true color textures overwrote the IDAT size with
+  the IDAT id when reading the image.
+
 September 6, 2009  (Changes by Graf Zahl)
 - fixed: Trying to pick up an object of the Ammo base class caused a crash.
 - changed line_t's sidenum into sidedef pointers.
diff --git a/src/textures/pngtexture.cpp b/src/textures/pngtexture.cpp
index 26e552de48..f612681e57 100644
--- a/src/textures/pngtexture.cpp
+++ b/src/textures/pngtexture.cpp
@@ -646,7 +646,7 @@ int FPNGTexture::CopyTrueColorPixels(FBitmap *bmp, int x, int y, int w, int h, i
 
 	lump->Seek (StartOfIDAT, SEEK_SET);
 	lump->Read(&len, 4);
-	lump->Read(&len, 4);
+	lump->Read(&id, 4);
 	M_ReadIDAT (lump, Pixels, Width, Height, pixwidth, BitDepth, ColorType, Interlace, BigLong((unsigned int)len));
 	delete lump;