diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/importing/MavenFoldersImporter.java b/plugins/maven/src/main/java/org/jetbrains/idea/maven/importing/MavenFoldersImporter.java
index c0117392c9bf..0eb5026bd3a8 100755
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/importing/MavenFoldersImporter.java
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/importing/MavenFoldersImporter.java
@@ -83,7 +83,7 @@ public class MavenFoldersImporter {
     });
   }
 
-  public MavenFoldersImporter(MavenProject mavenProject, MavenImportingSettings settings, MavenRootModelAdapter model) {
+  public MavenFoldersImporter(@NotNull MavenProject mavenProject, @NotNull MavenImportingSettings settings, MavenRootModelAdapter model) {
     myMavenProject = mavenProject;
     myImportingSettings = settings;
     myModel = model;