diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 8913ad0..bb7ba1b 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -503,6 +503,7 @@
 
 # Robolectric variables
 LOCAL_INSTRUMENT_SOURCE_DIRS :=
+LOCAL_INSTRUMENT_SRCJARS :=
 LOCAL_ROBOTEST_FAILURE_FATAL :=
 LOCAL_ROBOTEST_FILES :=
 LOCAL_ROBOTEST_TIMEOUT :=