diff --git a/tools/run-jdwp-tests.sh b/tools/run-jdwp-tests.sh
index 8422e20..354fcef 100755
--- a/tools/run-jdwp-tests.sh
+++ b/tools/run-jdwp-tests.sh
@@ -114,9 +114,6 @@
   art_debugee="$art_debugee -verbose:jdwp"
 fi
 
-# Use Jack with "1.8" configuration.
-export JACK_VERSION=`basename prebuilts/sdk/tools/jacks/*ALPHA* | sed 's/^jack-//' | sed 's/.jar$//'`
-
 # Run the tests using vogar.
 vogar $vm_command \
       $vm_args \
diff --git a/tools/run-libcore-tests.sh b/tools/run-libcore-tests.sh
index 45fb4b4d..00bb3c5 100755
--- a/tools/run-libcore-tests.sh
+++ b/tools/run-libcore-tests.sh
@@ -109,7 +109,6 @@
 vogar_args="$vogar_args --timeout 480"
 
 # Use Jack with "1.8" configuration.
-export JACK_VERSION=`basename prebuilts/sdk/tools/jacks/*ALPHA* | sed 's/^jack-//' | sed 's/.jar$//'`
 vogar_args="$vogar_args --toolchain jack --language JN"
 
 # Run the tests using vogar.