diff --git a/java/src/processing/mode/java/preproc/PdeParseTreeListener.java b/java/src/processing/mode/java/preproc/PdeParseTreeListener.java
index 8f1876bf3..ff6410f5a 100644
--- a/java/src/processing/mode/java/preproc/PdeParseTreeListener.java
+++ b/java/src/processing/mode/java/preproc/PdeParseTreeListener.java
@@ -1028,7 +1028,7 @@ public class PdeParseTreeListener extends ProcessingBaseListener {
           return;
         }
 
-        StringJoiner argJoiner = new StringJoiner(",");
+        StringJoiner argJoiner = new StringJoiner(", ");
         argJoiner.add(sketchWidth);
         argJoiner.add(sketchHeight);