diff --git a/src/arch/riscv/decoder.hh b/src/arch/riscv/decoder.hh
index 6ce72ee35a..c827e85f90 100644
--- a/src/arch/riscv/decoder.hh
+++ b/src/arch/riscv/decoder.hh
@@ -60,7 +60,7 @@ class Decoder : public InstDecoder
     ExtMachInst emi;
     uint32_t machInst;
 
-    StaticInstPtr decodeInst(ExtMachInst mach_inst);
+    virtual StaticInstPtr decodeInst(ExtMachInst mach_inst);
 
     /// Decode a machine instruction.
     /// @param mach_inst The binary instruction to decode.