diff --git a/generators/builtins/primitives/BooleanGenerator.kt b/generators/builtins/primitives/BooleanGenerator.kt
index 94ab0e9d949..bf3419a4a5f 100644
--- a/generators/builtins/primitives/BooleanGenerator.kt
+++ b/generators/builtins/primitives/BooleanGenerator.kt
@@ -224,12 +224,10 @@ class WasmBooleanGenerator(writer: PrintWriter) : BooleanGenerator(writer) {
     }
 
     override fun MethodBuilder.modifyGeneratedToString() {
-        modifySignature { visibility = null }
         "if (this) \"true\" else \"false\"".setAsExpressionBody()
     }
 
     override fun MethodBuilder.modifyGeneratedEquals() {
-        modifySignature { visibility = null }
         """
             return if (other !is Boolean) {
                 false
@@ -239,10 +237,6 @@ class WasmBooleanGenerator(writer: PrintWriter) : BooleanGenerator(writer) {
         """.trimIndent().setAsBlockBody()
     }
 
-    override fun MethodBuilder.modifyGeneratedHashCode() {
-        modifySignature { visibility = null }
-    }
-
     override fun ClassBuilder.generateAdditionalMethods() {
         method {
             annotations += "WasmNoOpCast"
@@ -307,10 +301,6 @@ class NativeBooleanGenerator(writer: PrintWriter) : BooleanGenerator(writer) {
         }
     }
 
-    override fun MethodBuilder.modifyGeneratedHashCode() {
-        modifySignature { visibility = MethodVisibility.PUBLIC }
-    }
-
     override fun ClassBuilder.generateAdditionalMethods() {
         generateCustomEquals()
     }
diff --git a/generators/builtins/primitives/CharGenerator.kt b/generators/builtins/primitives/CharGenerator.kt
index 6f96b088219..a5fbdeac9d7 100644
--- a/generators/builtins/primitives/CharGenerator.kt
+++ b/generators/builtins/primitives/CharGenerator.kt
@@ -547,7 +547,6 @@ class WasmCharGenerator(writer: PrintWriter) : CharGenerator(writer) {
     }
 
     override fun MethodBuilder.modifyGeneratedToString() {
-        modifySignature { visibility = null }
         """
             val array = WasmCharArray(1)
             array.set(0, this)
@@ -556,7 +555,6 @@ class WasmCharGenerator(writer: PrintWriter) : CharGenerator(writer) {
     }
 
     override fun MethodBuilder.modifyGeneratedHashCode() {
-        modifySignature { visibility = null }
         "this.code.hashCode()".setAsExpressionBody()
     }
 }
diff --git a/generators/builtins/primitives/builders.kt b/generators/builtins/primitives/builders.kt
index c0489349e6b..f9878f806ce 100644
--- a/generators/builtins/primitives/builders.kt
+++ b/generators/builtins/primitives/builders.kt
@@ -265,7 +265,7 @@ internal class SecondaryConstructorBuilder : AnnotatedAndDocumented(), Primitive
 
 internal class MethodSignatureBuilder : PrimitiveBuilder {
     var isExternal: Boolean = false
-    var visibility: MethodVisibility? = MethodVisibility.PUBLIC
+    var visibility: MethodVisibility = MethodVisibility.PUBLIC
     var isOverride: Boolean = false
     var isInline: Boolean = false
     var isInfix: Boolean = false
@@ -293,7 +293,7 @@ internal class MethodSignatureBuilder : PrimitiveBuilder {
         throwIfWasNotInitialized(returnType, "returnType", "MethodSignatureBuilder")
 
         return buildString {
-            visibility?.let { append("${it.name.lowercase()} ") }
+            append("${visibility.name.lowercase()} ")
             if (isExternal) append("external ")
             if (isOverride) append("override ")
             if (isInline) append("inline ")
diff --git a/libraries/stdlib/wasm/builtins/kotlin/Boolean.kt b/libraries/stdlib/wasm/builtins/kotlin/Boolean.kt
index a5ce8c51363..4a39d0ac895 100644
--- a/libraries/stdlib/wasm/builtins/kotlin/Boolean.kt
+++ b/libraries/stdlib/wasm/builtins/kotlin/Boolean.kt
@@ -53,11 +53,11 @@ public class Boolean private constructor(private val value: Boolean) : Comparabl
         wasm_i32_compareTo(this.toInt(), other.toInt())
 
     @kotlin.internal.IntrinsicConstEvaluation
-    override fun toString(): String =
+    public override fun toString(): String =
         if (this) "true" else "false"
 
     @kotlin.internal.IntrinsicConstEvaluation
-    override fun equals(other: Any?): Boolean {
+    public override fun equals(other: Any?): Boolean {
         return if (other !is Boolean) {
             false
         } else {
@@ -65,7 +65,7 @@ public class Boolean private constructor(private val value: Boolean) : Comparabl
         }
     }
 
-    override fun hashCode(): Int =
+    public override fun hashCode(): Int =
         if (this) 1231 else 1237
 
     @WasmNoOpCast
diff --git a/libraries/stdlib/wasm/builtins/kotlin/Char.kt b/libraries/stdlib/wasm/builtins/kotlin/Char.kt
index c6072a18966..7038be64282 100644
--- a/libraries/stdlib/wasm/builtins/kotlin/Char.kt
+++ b/libraries/stdlib/wasm/builtins/kotlin/Char.kt
@@ -118,7 +118,7 @@ public class Char private constructor(private val value: Char) : Comparable<Char
         this.code.toDouble()
 
     @kotlin.internal.IntrinsicConstEvaluation
-    override fun toString(): String {
+    public override fun toString(): String {
         val array = WasmCharArray(1)
         array.set(0, this)
         return array.createString()
@@ -131,7 +131,7 @@ public class Char private constructor(private val value: Char) : Comparable<Char
         return false
     }
 
-    override fun hashCode(): Int =
+    public override fun hashCode(): Int =
         this.code.hashCode()
 
     public companion object {