diff --git a/include-gpl/dsp/decimators.h b/include-gpl/dsp/decimators.h
index 348fb8bf5..0f5493b73 100644
--- a/include-gpl/dsp/decimators.h
+++ b/include-gpl/dsp/decimators.h
@@ -55,16 +55,16 @@ struct decimation_shifts<16, 12>
 template<>
 struct decimation_shifts<16, 8>
 {
-    static const uint pre1   = 8; 
-    static const uint pre2   = 7; 
+    static const uint pre1   = 5;
+    static const uint pre2   = 4;
     static const uint post2  = 0; 
-    static const uint pre4   = 6; 
+    static const uint pre4   = 3;
     static const uint post4  = 0; 
-    static const uint pre8   = 5; 
+    static const uint pre8   = 2;
     static const uint post8  = 0; 
-    static const uint pre16  = 4; 
+    static const uint pre16  = 1;
     static const uint post16 = 0; 
-    static const uint pre32  = 3; 
+    static const uint pre32  = 0;
     static const uint post32 = 0; 
 };