diff --git a/src/arch/arm/regs/misc_types.hh b/src/arch/arm/regs/misc_types.hh
index c139f1a38e..71fdd605ce 100644
--- a/src/arch/arm/regs/misc_types.hh
+++ b/src/arch/arm/regs/misc_types.hh
@@ -345,7 +345,7 @@ namespace ArmISA
         Bitfield<0>  cp0;
     EndBitUnion(NSACR)
 
-    BitUnion32(SCR)
+    BitUnion64(SCR)
         Bitfield<21> fien;
         Bitfield<20> nmea;
         Bitfield<19> ease;