diff --git a/private/nimz.nim b/private/nimz.nim
index e8ab06a..5cf04b9 100644
--- a/private/nimz.nim
+++ b/private/nimz.nim
@@ -410,7 +410,7 @@ proc readInt16(s: var BitStream): int =
   #go to first boundary of byte
   while (s.bitpointer and 0x7) != 0: inc s.bitpointer
   var p = s.bitpointer div 8 #byte position
-  if p + 2 >= s.data.len: raise newNZError("bit pointer will jump past memory")
+  if p + 2 > s.data.len: raise newNZError("bit pointer will jump past memory")
   result = ord(s.data[p]) + 256 * ord(s.data[p + 1])
   inc(s.bitpointer, 16)
 
diff --git a/tester/sample.png b/tester/sample.png
new file mode 100644
index 0000000..709d8b0
Binary files /dev/null and b/tester/sample.png differ
diff --git a/tester/test.nim b/tester/test.nim
new file mode 100644
index 0000000..c228b51
--- /dev/null
+++ b/tester/test.nim
@@ -0,0 +1,3 @@
+import nimPNG
+let data = loadPNG32("sample.png")
+assert(not data.isNil)
\ No newline at end of file