diff --git a/.changeset/sweet-seals-fold.md b/.changeset/sweet-seals-fold.md
index 30cbe98b6..7b17a4c91 100644
--- a/.changeset/sweet-seals-fold.md
+++ b/.changeset/sweet-seals-fold.md
@@ -2,4 +2,5 @@
 'providence-analytics': minor
 ---
 
-use globby again
+- use globby again
+- fix ast cache (prevent from endless expanding); expose amountOfCachedProjects
diff --git a/packages-node/providence-analytics/src/program/core/QueryService.js b/packages-node/providence-analytics/src/program/core/QueryService.js
index 008a1f741..53042d1f8 100644
--- a/packages-node/providence-analytics/src/program/core/QueryService.js
+++ b/packages-node/providence-analytics/src/program/core/QueryService.js
@@ -146,12 +146,12 @@ export class QueryService {
     }
     // In order to prevent running out of memory, there is a limit to the number of
     // project ASTs in cache. For a session running multiple analyzers for reference
-    // and target projects, we need this number to be at least 2.
-    if (astProjectsDataCache.size >= 2) {
-      astProjectsDataCache.delete(astProjectsDataCache.keys()[0]);
+    if (astProjectsDataCache.size >= this.amountOfCachedProjects) {
+      astProjectsDataCache.delete(astProjectsDataCache.keys().next().value);
     }
     astProjectsDataCache.set(pathAndRequiredAst, astData);
   }
 }
 QueryService.cacheDisabled = false;
+QueryService.amountOfCachedProjects = 2;
 QueryService.addAstToProjectsData = memoize(QueryService.addAstToProjectsData);