diff --git a/python/src/com/jetbrains/python/testing/AbstractPythonLegacyTestRunConfiguration.java b/python/src/com/jetbrains/python/testing/AbstractPythonLegacyTestRunConfiguration.java
index decd4bfeb678..fe30a19b675f 100644
--- a/python/src/com/jetbrains/python/testing/AbstractPythonLegacyTestRunConfiguration.java
+++ b/python/src/com/jetbrains/python/testing/AbstractPythonLegacyTestRunConfiguration.java
@@ -149,7 +149,7 @@ public abstract class AbstractPythonLegacyTestRunConfiguration<T extends Abstrac
     return myScriptName;
   }
 
-  public void setScriptName(String scriptName) {
+  public void setScriptName(@NotNull String scriptName) {
     myScriptName = scriptName;
   }
 
diff --git a/python/src/com/jetbrains/python/testing/AbstractPythonTestRunConfigurationParams.java b/python/src/com/jetbrains/python/testing/AbstractPythonTestRunConfigurationParams.java
index 33366f067fb2..7ebeb8067d6c 100644
--- a/python/src/com/jetbrains/python/testing/AbstractPythonTestRunConfigurationParams.java
+++ b/python/src/com/jetbrains/python/testing/AbstractPythonTestRunConfigurationParams.java
@@ -16,6 +16,7 @@
 package com.jetbrains.python.testing;
 
 import com.jetbrains.python.run.AbstractPythonRunConfigurationParams;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * User: catherine
@@ -30,7 +31,7 @@ public interface AbstractPythonTestRunConfigurationParams {
   void setFolderName(String folderName);
 
   String getScriptName();
-  void setScriptName(String scriptName);
+  void setScriptName(@NotNull String scriptName);
 
   String getMethodName();
   void setMethodName(String methodName);
diff --git a/python/src/com/jetbrains/python/testing/PythonTestRunConfigurationForm.java b/python/src/com/jetbrains/python/testing/PythonTestRunConfigurationForm.java
index 32b56f0ce14e..fc4ef504155c 100644
--- a/python/src/com/jetbrains/python/testing/PythonTestRunConfigurationForm.java
+++ b/python/src/com/jetbrains/python/testing/PythonTestRunConfigurationForm.java
@@ -25,6 +25,7 @@ import com.jetbrains.python.PyBundle;
 import com.jetbrains.python.run.AbstractPyCommonOptionsForm;
 import com.jetbrains.python.run.AbstractPythonRunConfigurationParams;
 import com.jetbrains.python.run.PyCommonOptionsFormFactory;
+import org.jetbrains.annotations.NotNull;
 
 import javax.swing.*;
 import java.awt.*;
@@ -170,7 +171,7 @@ public class PythonTestRunConfigurationForm implements AbstractPythonTestRunConf
     return toSystemIndependentName(myTestScriptTextField.getText().trim());
   }
 
-  public void setScriptName(String scriptName) {
+  public void setScriptName(@NotNull String scriptName) {
     myTestScriptTextField.setText(FileUtil.toSystemDependentName(scriptName));
   }