diff --git a/src/mips64/assembler-mips64.cc b/src/mips64/assembler-mips64.cc
index 5d51e63..b8f5821 100644
--- a/src/mips64/assembler-mips64.cc
+++ b/src/mips64/assembler-mips64.cc
@@ -2192,6 +2192,14 @@
 }
 
 
+void Assembler::dext_(Register rt, Register rs, uint16_t pos, uint16_t size) {
+  // Should be called via MacroAssembler::Ext.
+  // Dext instr has 'rt' field as dest, and two uint5: msb, lsb.
+  DCHECK(kArchVariant == kMips64r2 || kArchVariant == kMips64r6);
+  GenInstrRegister(SPECIAL3, rs, rt, size - 1, pos, DEXT);
+}
+
+
 void Assembler::pref(int32_t hint, const MemOperand& rs) {
   DCHECK(is_uint5(hint) && is_uint16(rs.offset_));
   Instr instr = PREF | (rs.rm().code() << kRsShift) | (hint << kRtShift)