diff --git a/Source/Core/Core/HW/DSPHLE/UCodes/AXStructs.h b/Source/Core/Core/HW/DSPHLE/UCodes/AXStructs.h
index 701d692e1cf..7ceed482164 100644
--- a/Source/Core/Core/HW/DSPHLE/UCodes/AXStructs.h
+++ b/Source/Core/Core/HW/DSPHLE/UCodes/AXStructs.h
@@ -195,7 +195,7 @@ struct PBLowPassFilter
   u16 on;
   s16 yn1;
   u16 a0;
-  u16 b0;
+  s16 b0;
 };
 
 struct AXPB