diff --git a/kotstd/include/BooleanArray.kt b/kotstd/include/BooleanArray.kt
index d39a0695fc5..e5c85c56b43 100644
--- a/kotstd/include/BooleanArray.kt
+++ b/kotstd/include/BooleanArray.kt
@@ -8,6 +8,11 @@ class BooleanArray(var size: Int) {
 
     init {
         this.data = malloc_array(kotlinclib_boolean_size() * this.size)
+        var index = 0
+        while (index < this.size) {
+            set(index, false)
+            index = index + 1
+        }
     }
 
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
diff --git a/kotstd/include/ByteArray.kt b/kotstd/include/ByteArray.kt
index bca1483879e..c746a236677 100644
--- a/kotstd/include/ByteArray.kt
+++ b/kotstd/include/ByteArray.kt
@@ -12,6 +12,11 @@ class ByteArray(var size: Int) {
 
     init {
         this.data = malloc_array(kotlinclib_byte_size() * this.size)
+        var index = 0
+        while (index < this.size) {
+            set(index, 0)
+            index = index + 1
+        }
     }
 
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
diff --git a/kotstd/include/IntArray.kt b/kotstd/include/IntArray.kt
index 7003dd63a53..48e9e5fdb22 100644
--- a/kotstd/include/IntArray.kt
+++ b/kotstd/include/IntArray.kt
@@ -11,6 +11,11 @@ class IntArray(var size: Int) {
 
     init {
         this.data = malloc_array(kotlinclib_int_size() * this.size)
+        var index = 0
+        while (index < this.size) {
+            set(index, 0)
+            index = index + 1
+        }
     }
 
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
diff --git a/kotstd/include/LongArray.kt b/kotstd/include/LongArray.kt
index 683ce2130a2..210b22625b7 100644
--- a/kotstd/include/LongArray.kt
+++ b/kotstd/include/LongArray.kt
@@ -11,6 +11,11 @@ class LongArray(var size: Int) {
 
     init {
         this.data = malloc_array(kotlinclib_long_size() * this.size)
+        var index = 0
+        while (index < this.size) {
+            set(index, 0)
+            index = index + 1
+        }
     }
 
     /** Returns the array element at the given [index]. This method can be called using the index operator. */
diff --git a/kotstd/include/ShortArray.kt b/kotstd/include/ShortArray.kt
index 5e2d8e97ea6..798fa96975f 100644
--- a/kotstd/include/ShortArray.kt
+++ b/kotstd/include/ShortArray.kt
@@ -11,6 +11,11 @@ class ShortArray(var size: Int) {
 
     init {
         this.data = malloc_array(kotlinclib_short_size() * this.size)
+        var index = 0
+        while (index < this.size) {
+            set(index, 0)
+            index = index + 1
+        }
     }
 
     /** Returns the array element at the given [index]. This method can be called using the index operator. */