diff --git a/platform/platform-impl/src/com/intellij/execution/process/ColoredProcessHandler.java b/platform/platform-impl/src/com/intellij/execution/process/ColoredProcessHandler.java
index fb6cd62a6fdd..5190a69700b6 100644
--- a/platform/platform-impl/src/com/intellij/execution/process/ColoredProcessHandler.java
+++ b/platform/platform-impl/src/com/intellij/execution/process/ColoredProcessHandler.java
@@ -43,7 +43,7 @@ public class ColoredProcessHandler extends KillableProcessHandler implements Ans
   /**
    * {@code commandLine} must not be not empty (for correct thread attribution in the stacktrace)
    */
-  public ColoredProcessHandler(@NotNull Process process, /*@NotNull*/ String commandLine, @NotNull Charset charset, @Nullable Set<File> filesToDelete) {
+  public ColoredProcessHandler(@NotNull Process process, /*@NotNull*/ String commandLine, @NotNull Charset charset, @Nullable Set<? extends File> filesToDelete) {
     super(process, commandLine, charset, filesToDelete);
     setShouldKillProcessSoftly(false);
   }
diff --git a/platform/platform-impl/src/com/intellij/execution/process/KillableColoredProcessHandler.java b/platform/platform-impl/src/com/intellij/execution/process/KillableColoredProcessHandler.java
index 3f3a88629bb2..705e42d8f855 100644
--- a/platform/platform-impl/src/com/intellij/execution/process/KillableColoredProcessHandler.java
+++ b/platform/platform-impl/src/com/intellij/execution/process/KillableColoredProcessHandler.java
@@ -52,7 +52,7 @@ public class KillableColoredProcessHandler extends ColoredProcessHandler impleme
    */
   public KillableColoredProcessHandler(@NotNull Process process, /*@NotNull*/ String commandLine,
                                        @NotNull Charset charset,
-                                       @Nullable Set<File> filesToDelete) {
+                                       @Nullable Set<? extends File> filesToDelete) {
     super(process, commandLine, charset, filesToDelete);
     setShouldKillProcessSoftly(true);
   }
@@ -69,7 +69,7 @@ public class KillableColoredProcessHandler extends ColoredProcessHandler impleme
       super(commandLine);
     }
 
-    public Silent(@NotNull Process process, String commandLine, @NotNull Charset charset, @Nullable Set<File> filesToDetele) {
+    public Silent(@NotNull Process process, String commandLine, @NotNull Charset charset, @Nullable Set<? extends File> filesToDetele) {
       super(process, commandLine, charset, filesToDetele);
     }
 
diff --git a/platform/platform-impl/src/com/intellij/execution/process/KillableProcessHandler.java b/platform/platform-impl/src/com/intellij/execution/process/KillableProcessHandler.java
index 33b0c0f318e7..e4bb31fa892b 100644
--- a/platform/platform-impl/src/com/intellij/execution/process/KillableProcessHandler.java
+++ b/platform/platform-impl/src/com/intellij/execution/process/KillableProcessHandler.java
@@ -66,7 +66,7 @@ public class KillableProcessHandler extends OSProcessHandler implements Killable
   public KillableProcessHandler(@NotNull Process process, /*@NotNull*/
                                 String commandLine,
                                 @NotNull Charset charset,
-                                @Nullable Set<File> filesToDelete) {
+                                @Nullable Set<? extends File> filesToDelete) {
     super(process, commandLine, charset, filesToDelete);
     myMediatedProcess = false;
   }
diff --git a/platform/platform-util-io/src/com/intellij/execution/process/OSProcessHandler.java b/platform/platform-util-io/src/com/intellij/execution/process/OSProcessHandler.java
index 657f53caec33..e1585ad6cb84 100644
--- a/platform/platform-util-io/src/com/intellij/execution/process/OSProcessHandler.java
+++ b/platform/platform-util-io/src/com/intellij/execution/process/OSProcessHandler.java
@@ -34,13 +34,13 @@ public class OSProcessHandler extends BaseOSProcessHandler {
   private static final Set<String> REPORTED_EXECUTIONS = ContainerUtil.newConcurrentSet();
   private static final long ALLOWED_TIMEOUT_THRESHOLD = 10;
 
-  static final Key<Set<File>> DELETE_FILES_ON_TERMINATION = Key.create("OSProcessHandler.FileToDelete");
+  private static final Key<Set<File>> DELETE_FILES_ON_TERMINATION = Key.create("OSProcessHandler.FileToDelete");
 
   private final boolean myHasErrorStream;
   private final ModalityState myModality;
   private boolean myHasPty;
   private boolean myDestroyRecursively = true;
-  private final Set<File> myFilesToDelete;
+  private final Set<? extends File> myFilesToDelete;
 
   public OSProcessHandler(@NotNull GeneralCommandLine commandLine) throws ExecutionException {
     super(startProcess(commandLine), commandLine.getCommandLineString(), commandLine.getCharset());
@@ -84,7 +84,7 @@ public class OSProcessHandler extends BaseOSProcessHandler {
   /**
    * {@code commandLine} must not be empty (for correct thread attribution in the stacktrace)
    */
-  public OSProcessHandler(@NotNull Process process, /*@NotNull*/ String commandLine, @Nullable Charset charset, @Nullable Set<File> filesToDelete) {
+  public OSProcessHandler(@NotNull Process process, /*@NotNull*/ String commandLine, @Nullable Charset charset, @Nullable Set<? extends File> filesToDelete) {
     super(process, commandLine, charset);
     setHasPty(isPtyProcess(process));
     myFilesToDelete = filesToDelete;