diff --git a/pdex/src/processing/mode/experimental/ASTGenerator.java b/pdex/src/processing/mode/experimental/ASTGenerator.java
index 077523276..f1dd78f70 100644
--- a/pdex/src/processing/mode/experimental/ASTGenerator.java
+++ b/pdex/src/processing/mode/experimental/ASTGenerator.java
@@ -3317,7 +3317,7 @@ public class ASTGenerator {
   
   public void suggestImports(final String className){
     if(ignoredImportSuggestions == null) {
-      ignoredImportSuggestions = new TreeSet<>();
+      ignoredImportSuggestions = new TreeSet<String>();
     } else {
       if(ignoredImportSuggestions.contains(className)) {
         log("Ignoring import suggestions for " + className);