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-rw-r--r--src/arch/alpha/isa/decoder.isa2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/arch/alpha/isa/decoder.isa b/src/arch/alpha/isa/decoder.isa
index 584d64a3d..f5483d9c0 100644
--- a/src/arch/alpha/isa/decoder.isa
+++ b/src/arch/alpha/isa/decoder.isa
@@ -762,7 +762,7 @@ decode OPCODE default Unknown::unknown() {
1: hw_mtpr({{
int miscRegIndex = (ipr_index < NumInternalProcRegs) ?
IprToMiscRegIndex[ipr_index] : -1;
- if(miscRegIndex < 0 || !IprIsWritable(miscRegIndex)
+ if(miscRegIndex < 0 || !IprIsWritable(miscRegIndex) ||
miscRegIndex >= NumInternalProcRegs)
fault = new UnimplementedOpcodeFault;
else