diff --git a/src/arch/sparc/regfile.hh b/src/arch/sparc/regfile.hh
index dd4e1f684..505d7c8d7 100644
--- a/src/arch/sparc/regfile.hh
+++ b/src/arch/sparc/regfile.hh
@@ -71,8 +71,6 @@ namespace SparcISA
 
         void clear();
 
-        int FlattenIntIndex(int reg);
-
         MiscReg readMiscRegNoEffect(int miscReg);
 
         MiscReg readMiscReg(int miscReg, ThreadContext *tc);
diff --git a/src/arch/x86/regfile.hh b/src/arch/x86/regfile.hh
index 75c0290d3..8938ab0bc 100644
--- a/src/arch/x86/regfile.hh
+++ b/src/arch/x86/regfile.hh
@@ -97,8 +97,6 @@ namespace X86ISA
 
         void clear();
 
-        int FlattenIntIndex(int reg);
-
         MiscReg readMiscRegNoEffect(int miscReg);
 
         MiscReg readMiscReg(int miscReg, ThreadContext *tc);