diff --git a/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java b/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java
index 266685e0abf..883b6efb859 100644
--- a/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java
+++ b/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java
@@ -461,7 +461,7 @@ public class AutoBuild {
         warn("No JavaScript or TypeScript code found.");
       }
       // ensuring that the finalize steps detects that no code was seen. 
-      Path srcFolder = Paths.get(EnvironmentVariables.getWipDatabase() + "/src");
+      Path srcFolder = Paths.get(EnvironmentVariables.getWipDatabase(), "src");
       // check that the srcFolder is empty
       if (Files.list(srcFolder).count() == 0) {
         // Non-recursive delete because "src/" should be empty.