diff --git a/defextract.py b/defextract.py
index 60e7621..fb6f9c6 100644
--- a/defextract.py
+++ b/defextract.py
@@ -93,10 +93,13 @@ def extract_def(infile,outdir,shred=True):
                                 pixeldata += length*chr(code)
                             totalrowlength+=length
                 elif fmt == 2:
-                    coff, = struct.unpack("<H", f.read(2))
-                    coff += 32
-                    f.seek(coff)
-                    for i in range(h):
+                    lineoffs = struct.unpack("<%dH"%h, f.read(2*h))
+                    # unknown 
+                    _,_ = struct.unpack("<BB", f.read(2))
+                    for lineoff in lineoffs:
+                        if f.tell() != offs+32+lineoff:
+                            print "unexpected offset: %d, expected %d"%(f.tell(),offs+32+lineoff)
+                            f.seek(offs+32+lineoff)
                         totalrowlength=0
                         while totalrowlength<w:
                             segment, = struct.unpack("<B", f.read(1))
diff --git a/makedef.py b/makedef.py
index 9a15b07..5ca005b 100644
--- a/makedef.py
+++ b/makedef.py
@@ -209,8 +209,8 @@ def makedef(indir, outdir):
                 # 4*height bytes for lineoffsets
                 curoffset += 32+4*h+sum(len(d) for d in data)
             elif fmt == 2:
-                # two bytes for the header
-                curoffset += 32+2+sum(len(d) for d in data)
+                # 2*height bytes for lineoffsets plus two unknown bytes
+                curoffset += 32+2*h+2+sum(len(d) for d in data)
             elif fmt == 3:
                 # width/16 bytes per line as offset header
                 curoffset += 32+(w/16)*h+sum(len(d) for d in data)
@@ -240,13 +240,19 @@ def makedef(indir, outdir):
                 for i in data:
                     outf.write(i)
             elif fmt == 2:
-                s = 2+sum(len(d) for d in data)
+                s = 2*h+2+sum(len(d) for d in data)
                 outf.write(struct.pack("<IIIIIIii",s,fmt,fw,fh,w,h,lm,tm))
-                offs = outf.tell()-32+2
-                if offs > ushrtmax: 
-                    print "exceeding max ushort value: %d"%offs
-                    return False
-                outf.write(struct.pack("<H",offs))
+                lineoffs = []
+                acc = 0
+                for d in data:
+                    offs = acc+2*h+2
+                    if offs > ushrtmax: 
+                        print "exceeding max ushort value: %d"%offs
+                        return False
+                    lineoffs.append(offs)
+                    acc += len(d)
+                outf.write(struct.pack("<%dH"%h, *lineoffs))
+                outf.write(struct.pack("<BB", 0, 0)) # unknown function
                 for i in data:
                     outf.write(i)
             elif fmt == 3: