diff --git a/planetaryimage/decoders.py b/planetaryimage/decoders.py
index 5f058b4..678992d 100644
--- a/planetaryimage/decoders.py
+++ b/planetaryimage/decoders.py
@@ -15,7 +15,7 @@ def size(self):
 
     def decode(self, stream):
         if self.compression:
-            data = numpy.fromstring(stream.read(self.size*self.sample_bytes), self.dtype)
+            data = numpy.frombuffer(stream.read(self.size*self.sample_bytes), self.dtype)
         else:
             data = numpy.fromfile(stream, self.dtype, self.size)
         return data.reshape(self.shape)
diff --git a/planetaryimage/specialpixels.py b/planetaryimage/specialpixels.py
index cfbb8f3..b7799c0 100644
--- a/planetaryimage/specialpixels.py
+++ b/planetaryimage/specialpixels.py
@@ -17,7 +17,7 @@
 
 
 def _make_num(num, dtype):
-    return numpy.fromstring(num, dtype=dtype)[0]
+    return numpy.frombuffer(num, dtype=dtype)[0]
 
 
 SPECIAL_PIXELS = {