diff --git a/jps/jps-plugin/test/org/jetbrains/jet/jps/build/AbstractIncrementalJpsTest.kt b/jps/jps-plugin/test/org/jetbrains/jet/jps/build/AbstractIncrementalJpsTest.kt
index 1879580f7d1..edd44cf39c1 100644
--- a/jps/jps-plugin/test/org/jetbrains/jet/jps/build/AbstractIncrementalJpsTest.kt
+++ b/jps/jps-plugin/test/org/jetbrains/jet/jps/build/AbstractIncrementalJpsTest.kt
@@ -187,7 +187,16 @@ public abstract class AbstractIncrementalJpsTest : JpsBuildTestCase() {
 
     private class ModifyContent(name: String, val dataFile: File) : Modification(name) {
         override fun perform(workDir: File) {
-            dataFile.copyTo(File(workDir, "src/$name"))
+            val file = File(workDir, "src/$name")
+
+            val oldLastModified = file.lastModified()
+            dataFile.copyTo(file)
+
+            val newLastModified = file.lastModified()
+            if (newLastModified <= oldLastModified) {
+                //Mac OS and some versions of Linux truncate timestamp to nearest second
+                file.setLastModified(oldLastModified + 1000)
+            }
         }
     }