diff --git a/src/arch/sparc/registers.hh b/src/arch/sparc/registers.hh
index a7f4d2a152..b5acaeff1b 100644
--- a/src/arch/sparc/registers.hh
+++ b/src/arch/sparc/registers.hh
@@ -47,8 +47,8 @@ using SparcISAInst::MaxMiscDestRegs;
 
 typedef uint64_t IntReg;
 typedef uint64_t MiscReg;
-typedef float FloatReg;
-typedef uint32_t FloatRegBits;
+typedef double FloatReg;
+typedef uint64_t FloatRegBits;
 
 // dummy typedef since we don't have CC regs
 typedef uint8_t CCReg;