diff --git a/buffer.py b/buffer.py
index fd2a640..c9e4e6f 100644
--- a/buffer.py
+++ b/buffer.py
@@ -527,7 +527,7 @@ class Binary32Buffer(FileBuffer):
         FileBuffer.__init__(self, path, nl, name)
     def cursorx_to_datax(self, cy, cx):
         bytespace = 2 + self.bytepad
-        groupspace = bytespace * self.groupsize - 1 + self.grouppad
+        groupspace = bytespace * self.groupsize - self.bytepad + self.grouppad
 
         groupmod = (cx + self.grouppad) % groupspace
         if groupmod < self.grouppad:
@@ -542,7 +542,7 @@ class Binary32Buffer(FileBuffer):
             return None
         
         bytediv = ((cx + self.bytepad) % groupspace) // bytespace
-        ix = self.groupsize * groupdiv + bytediv
+        ix = self.groupsize * groupdiv  + bytediv
         if ix < len(self.rawdata[cy]):
             return ix
         else: