diff --git a/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt b/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
index 04f41734..50a508a6 100644
--- a/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
+++ b/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
@@ -1,7 +1,7 @@
 package net.dankito.utils.multiplatform
 
 
-expect class StackTraceHelper {
+expect class StackTraceHelper actual constructor() {
 
     fun getStackTrace(e: Throwable, maxCountStackTraceElements: Int? = null): String
 
diff --git a/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt b/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
index 3d713667..405e2665 100644
--- a/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
+++ b/common/src/commonMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
@@ -1,7 +1,7 @@
 package net.dankito.utils.multiplatform.os
 
 
-expect class OsHelper {
+expect class OsHelper() {
 
     val osType: OsType
 
diff --git a/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt b/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
index 11c5714f..45db401b 100644
--- a/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
+++ b/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
@@ -1,7 +1,7 @@
 package net.dankito.utils.multiplatform
 
 
-actual class StackTraceHelper {
+actual class StackTraceHelper() {
 
     actual fun getStackTrace(e: Throwable, maxCountStackTraceElements: Int?): String {
         var stackTrace = e.getStackTrace()
diff --git a/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt b/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
index 70cd2db3..e409affd 100644
--- a/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
+++ b/common/src/iosMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
@@ -1,7 +1,8 @@
 package net.dankito.utils.multiplatform.os
 
 
-actual class OsHelper {
+actual class OsHelper actual constructor() {
+
 
     actual val osType = OsType.iOS
 
diff --git a/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt b/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
index 33aae61d..f9728b61 100644
--- a/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
+++ b/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/StackTraceHelper.kt
@@ -4,7 +4,7 @@ import java.io.PrintWriter
 import java.io.StringWriter
 
 
-actual class StackTraceHelper {
+actual class StackTraceHelper actual constructor() {
 
     actual fun getStackTrace(e: Throwable, maxCountStackTraceElements: Int?): String {
         val stringWriter = StringWriter()
diff --git a/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt b/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
index 126f7286..c2a94068 100644
--- a/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
+++ b/common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/os/OsHelper.kt
@@ -1,7 +1,8 @@
 package net.dankito.utils.multiplatform.os
 
 
-actual open class OsHelper {
+actual open class OsHelper actual constructor() {
+
 
     actual val osType: OsType
         get() {