diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/TypeOperatorLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/TypeOperatorLowering.kt
index f9f623305ba..2b36821c187 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/TypeOperatorLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/TypeOperatorLowering.kt
@@ -317,7 +317,9 @@ class TypeOperatorLowering(val context: JsIrBackendContext) : FileLoweringPass {
                 val casted = when {
                     toType.isByte() -> maskOp(argument, byteMask, lit24)
                     toType.isShort() -> maskOp(argument, shortMask, lit16)
-                    toType.isLong() -> TODO("Long coercion")
+                    toType.isLong() -> JsIrBuilder.buildCall(context.intrinsics.jsToLong).apply {
+                        putValueArgument(0, argument)
+                    }
                     else -> error("Unreachable execution (coercion to non-Integer type")
                 }
 
diff --git a/compiler/testData/codegen/box/binaryOp/call.kt b/compiler/testData/codegen/box/binaryOp/call.kt
index 3831312a004..0f3d0139001 100644
--- a/compiler/testData/codegen/box/binaryOp/call.kt
+++ b/compiler/testData/codegen/box/binaryOp/call.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun box(): String {
     val a1: Byte = 1.plus(1)
     val a2: Short = 1.plus(1)
diff --git a/compiler/testData/codegen/box/binaryOp/callNullable.kt b/compiler/testData/codegen/box/binaryOp/callNullable.kt
index 61f544cba27..0167a38ed04 100644
--- a/compiler/testData/codegen/box/binaryOp/callNullable.kt
+++ b/compiler/testData/codegen/box/binaryOp/callNullable.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun box(): String {
     val a1: Byte? = 1.plus(1)
     val a2: Short? = 1.plus(1)
diff --git a/compiler/testData/codegen/box/binaryOp/intrinsic.kt b/compiler/testData/codegen/box/binaryOp/intrinsic.kt
index 6701f53d554..7434a7848e5 100644
--- a/compiler/testData/codegen/box/binaryOp/intrinsic.kt
+++ b/compiler/testData/codegen/box/binaryOp/intrinsic.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun box(): String {
     val a1: Byte = 1 + 1
     val a2: Short = 1 + 1
diff --git a/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt b/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt
index 7ce75ab7579..fdfc98f3bb4 100644
--- a/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt
+++ b/compiler/testData/codegen/box/binaryOp/intrinsicNullable.kt
@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 fun box(): String {
     val a1: Byte? = 1 + 1
     val a2: Short? = 1 + 1