diff --git a/core/build.gradle b/core/build.gradle
index 75c5cba02..5d8503fb5 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -330,6 +330,7 @@ dependencies {
   testCompile deps['org.junit.platform:junit-platform-suite-api']
   testCompile deps['org.mockito:mockito-core']
   testCompile deps['org.mockito:mockito-junit-jupiter']
+  testCompile 'org.checkerframework:checker-qual:3.9.1'
   runtime deps['org.postgresql:postgresql']
 
   // Indirect dependency found by undeclared-dependency check. Such