diff --git a/js/src/jit/mips/MacroAssembler-mips.cpp b/js/src/jit/mips/MacroAssembler-mips.cpp
index 853a832ef8a7..b30f2a7d1c28 100644
--- a/js/src/jit/mips/MacroAssembler-mips.cpp
+++ b/js/src/jit/mips/MacroAssembler-mips.cpp
@@ -50,6 +50,13 @@ MacroAssemblerMIPS::convertInt32ToDouble(const Address& src, FloatRegister dest)
     as_cvtdw(dest, dest);
 }
 
+void
+MacroAssemblerMIPS::convertInt32ToDouble(const BaseIndex& src, FloatRegister dest)
+{
+    computeScaledAddress(src, SecondScratchReg);
+    convertInt32ToDouble(Address(SecondScratchReg, src.offset), dest);
+}
+
 void
 MacroAssemblerMIPS::convertUInt32ToDouble(Register src, FloatRegister dest)
 {
diff --git a/js/src/jit/mips/MacroAssembler-mips.h b/js/src/jit/mips/MacroAssembler-mips.h
index c639fd8775f0..7c959b154ab9 100644
--- a/js/src/jit/mips/MacroAssembler-mips.h
+++ b/js/src/jit/mips/MacroAssembler-mips.h
@@ -84,6 +84,7 @@ class MacroAssemblerMIPS : public Assembler
     void convertBoolToInt32(Register source, Register dest);
     void convertInt32ToDouble(Register src, FloatRegister dest);
     void convertInt32ToDouble(const Address& src, FloatRegister dest);
+    void convertInt32ToDouble(const BaseIndex& src, FloatRegister dest);
     void convertUInt32ToDouble(Register src, FloatRegister dest);
     void convertUInt32ToFloat32(Register src, FloatRegister dest);
     void convertDoubleToFloat32(FloatRegister src, FloatRegister dest);