diff --git a/src/arch/sparc/isa/operands.isa b/src/arch/sparc/isa/operands.isa
index 9dcd73598..40926a5fb 100644
--- a/src/arch/sparc/isa/operands.isa
+++ b/src/arch/sparc/isa/operands.isa
@@ -48,7 +48,7 @@ output header {{
     // MSB put in the LSB position but are otherwise normal.
     static inline unsigned int dfpr(unsigned int regNum)
     {
-        return regNum | ((regNum & 1) << 5);
+        return (regNum & (~1)) | ((regNum & 1) << 5);
     }
 }};