diff --git a/javascript/ql/lib/semmle/javascript/filters/ClassifyFiles.qll b/javascript/ql/lib/semmle/javascript/filters/ClassifyFiles.qll
index 5dd44226351..3e12cc2d96e 100644
--- a/javascript/ql/lib/semmle/javascript/filters/ClassifyFiles.qll
+++ b/javascript/ql/lib/semmle/javascript/filters/ClassifyFiles.qll
@@ -73,6 +73,7 @@ predicate isExternsFile(File f) {
 /**
  * Holds if `f` contains library code.
  */
+pragma[nomagic]
 predicate isLibraryFile(File f) { f.getATopLevel() instanceof FrameworkLibraryInstance }
 
 /**