diff --git a/compiler/testData/codegen/box/primitiveTypes/comparisonWithNaN.kt b/compiler/testData/codegen/box/primitiveTypes/comparisonWithNaN.kt
index 2b7885fc585..4acf18bf4cb 100644
--- a/compiler/testData/codegen/box/primitiveTypes/comparisonWithNaN.kt
+++ b/compiler/testData/codegen/box/primitiveTypes/comparisonWithNaN.kt
@@ -1,57 +1,57 @@
 // This test checks that our bytecode is consistent with javac bytecode
 
-fun assert(condition: Boolean): Unit =
+fun _assert(condition: Boolean): Unit =
     if (!condition) throw AssertionError("Fail")
 
-fun assertFalse(condition: Boolean) = assert(!condition)
+fun _assertFalse(condition: Boolean) = _assert(!condition)
 
 fun box(): String {
     var dnan = java.lang.Double.NaN
     if (System.nanoTime() < 0) dnan = 3.14 // To avoid possible compile-time const propagation
 
-    assertFalse(0.0 < dnan)
-    assertFalse(0.0 > dnan)
-    assertFalse(0.0 <= dnan)
-    assertFalse(0.0 >= dnan)
-    assertFalse(0.0 == dnan)
-    assertFalse(dnan < 0.0)
-    assertFalse(dnan > 0.0)
-    assertFalse(dnan <= 0.0)
-    assertFalse(dnan >= 0.0)
-    assertFalse(dnan == 0.0)
-    assertFalse(dnan < dnan)
-    assertFalse(dnan > dnan)
-    assertFalse(dnan <= dnan)
-    assertFalse(dnan >= dnan)
-    assertFalse(dnan == dnan)
+    _assertFalse(0.0 < dnan)
+    _assertFalse(0.0 > dnan)
+    _assertFalse(0.0 <= dnan)
+    _assertFalse(0.0 >= dnan)
+    _assertFalse(0.0 == dnan)
+    _assertFalse(dnan < 0.0)
+    _assertFalse(dnan > 0.0)
+    _assertFalse(dnan <= 0.0)
+    _assertFalse(dnan >= 0.0)
+    _assertFalse(dnan == 0.0)
+    _assertFalse(dnan < dnan)
+    _assertFalse(dnan > dnan)
+    _assertFalse(dnan <= dnan)
+    _assertFalse(dnan >= dnan)
+    _assertFalse(dnan == dnan)
     
     // Double.compareTo: "NaN is considered by this method to be equal to itself and greater than all other values"
-    assert(0.0.compareTo(dnan) == -1)
-    assert(dnan.compareTo(0.0) == 1)
-    assert(dnan.compareTo(dnan) == 0)
+    _assert(0.0.compareTo(dnan) == -1)
+    _assert(dnan.compareTo(0.0) == 1)
+    _assert(dnan.compareTo(dnan) == 0)
 
     var fnan = java.lang.Float.NaN
     if (System.nanoTime() < 0) fnan = 3.14f
 
-    assertFalse(0.0f < fnan)
-    assertFalse(0.0f > fnan)
-    assertFalse(0.0f <= fnan)
-    assertFalse(0.0f >= fnan)
-    assertFalse(0.0f == fnan)
-    assertFalse(fnan < 0.0f)
-    assertFalse(fnan > 0.0f)
-    assertFalse(fnan <= 0.0f)
-    assertFalse(fnan >= 0.0f)
-    assertFalse(fnan == 0.0f)
-    assertFalse(fnan < fnan)
-    assertFalse(fnan > fnan)
-    assertFalse(fnan <= fnan)
-    assertFalse(fnan >= fnan)
-    assertFalse(fnan == fnan)
+    _assertFalse(0.0f < fnan)
+    _assertFalse(0.0f > fnan)
+    _assertFalse(0.0f <= fnan)
+    _assertFalse(0.0f >= fnan)
+    _assertFalse(0.0f == fnan)
+    _assertFalse(fnan < 0.0f)
+    _assertFalse(fnan > 0.0f)
+    _assertFalse(fnan <= 0.0f)
+    _assertFalse(fnan >= 0.0f)
+    _assertFalse(fnan == 0.0f)
+    _assertFalse(fnan < fnan)
+    _assertFalse(fnan > fnan)
+    _assertFalse(fnan <= fnan)
+    _assertFalse(fnan >= fnan)
+    _assertFalse(fnan == fnan)
 
-    assert(0.0.compareTo(fnan) == -1)
-    assert(fnan.compareTo(0.0) == 1)
-    assert(fnan.compareTo(fnan) == 0)
+    _assert(0.0.compareTo(fnan) == -1)
+    _assert(fnan.compareTo(0.0) == 1)
+    _assert(fnan.compareTo(fnan) == 0)
     
     return "OK"
 }