diff --git a/js/src/jit/CodeGenerator.cpp b/js/src/jit/CodeGenerator.cpp
index 0459592448..5c2d9ac4e7 100644
--- a/js/src/jit/CodeGenerator.cpp
+++ b/js/src/jit/CodeGenerator.cpp
@@ -2378,6 +2378,8 @@ CodeGenerator::visitUnarySharedStub(LUnarySharedStub* lir)
     switch (jsop) {
       case JSOP_BITNOT:
       case JSOP_NEG:
+      case JSOP_INC:
+      case JSOP_DEC:
         emitSharedStub(ICStub::Kind::UnaryArith_Fallback, lir);
         break;
       case JSOP_CALLPROP:
diff --git a/js/src/jit/x64/SharedIC-x64.cpp b/js/src/jit/x64/SharedIC-x64.cpp
index 9e38cef6bf..ccad231d90 100644
--- a/js/src/jit/x64/SharedIC-x64.cpp
+++ b/js/src/jit/x64/SharedIC-x64.cpp
@@ -216,6 +216,16 @@ ICUnaryArith_Int32::Compiler::generateStubCode(MacroAssembler& masm)
         masm.branchTest32(Assembler::Zero, R0.valueReg(), Imm32(0x7fffffff), &failure);
         masm.negl(R0.valueReg());
         break;
+      case JSOP_INC: {
+        RegisterOrInt32Constant rval = RegisterOrInt32Constant(R0.valueReg());
+        masm.inc32(&rval);
+        break;
+      }
+      case JSOP_DEC: {
+        RegisterOrInt32Constant rval = RegisterOrInt32Constant(R0.valueReg());
+        masm.dec32(&rval);
+        break;
+      }
       default:
         MOZ_CRASH("Unexpected op");
     }
diff --git a/js/src/jit/x86/SharedIC-x86.cpp b/js/src/jit/x86/SharedIC-x86.cpp
index ee00e1bf0d..b293106ce3 100644
--- a/js/src/jit/x86/SharedIC-x86.cpp
+++ b/js/src/jit/x86/SharedIC-x86.cpp
@@ -226,6 +226,17 @@ ICUnaryArith_Int32::Compiler::generateStubCode(MacroAssembler& masm)
         masm.branchTest32(Assembler::Zero, R0.payloadReg(), Imm32(0x7fffffff), &failure);
         masm.negl(R0.payloadReg());
         break;
+      case JSOP_INC: {
+        RegisterOrInt32Constant rval = RegisterOrInt32Constant(R0.payloadReg());
+        masm.inc32(&rval);
+        break;
+      }
+      case JSOP_DEC: {
+        RegisterOrInt32Constant rval = RegisterOrInt32Constant(R0.payloadReg());
+        masm.dec32(&rval);
+        break;
+      }
+
       default:
         MOZ_CRASH("Unexpected op");
     }