diff --git a/core/util.runtime/src/org/jetbrains/kotlin/utils/numbers.kt b/core/util.runtime/src/org/jetbrains/kotlin/utils/numbers.kt
index a30e2c2c7f8..30e872e9725 100644
--- a/core/util.runtime/src/org/jetbrains/kotlin/utils/numbers.kt
+++ b/core/util.runtime/src/org/jetbrains/kotlin/utils/numbers.kt
@@ -23,11 +23,3 @@ fun extractRadix(value: String): NumberWithRadix = when {
     value.startsWith("0b") || value.startsWith("0B") -> NumberWithRadix(value.substring(2), 2)
     else -> NumberWithRadix(value, 10)
 }
-
-val NumberWithRadix.radixPrefix: String
-    get() = when (radix) {
-        2 -> "0b"
-        10 -> ""
-        16 -> "0x"
-        else -> error("Invalid radix for $this")
-    }
diff --git a/nj2k/src/org/jetbrains/kotlin/nj2k/conversions/ForConversion.kt b/nj2k/src/org/jetbrains/kotlin/nj2k/conversions/ForConversion.kt
index ae0c57a00b9..d01a16cc43e 100644
--- a/nj2k/src/org/jetbrains/kotlin/nj2k/conversions/ForConversion.kt
+++ b/nj2k/src/org/jetbrains/kotlin/nj2k/conversions/ForConversion.kt
@@ -17,8 +17,8 @@ import org.jetbrains.kotlin.nj2k.tree.*
 import org.jetbrains.kotlin.nj2k.types.JKJavaArrayType
 import org.jetbrains.kotlin.nj2k.types.JKJavaPrimitiveType
 import org.jetbrains.kotlin.nj2k.types.JKNoType
+import org.jetbrains.kotlin.utils.NumberWithRadix
 import org.jetbrains.kotlin.utils.extractRadix
-import org.jetbrains.kotlin.utils.radixPrefix
 import kotlin.math.abs
 
 
@@ -231,6 +231,14 @@ class ForConversion(context: NewJ2kConverterContext) : RecursiveApplicableConver
         return "${numberWithRadix.radixPrefix}${fixedValue}"
     }
 
+    private val NumberWithRadix.radixPrefix: String
+        get() = when (radix) {
+            2 -> "0b"
+            10 -> ""
+            16 -> "0x"
+            else -> error("Invalid radix for $this")
+        }
+
     private fun indicesIterationRange(
         start: JKExpression,
         bound: JKExpression,