diff --git a/tools/ci_testing/addons_gpu.sh b/tools/ci_testing/addons_gpu.sh
index c76bf5d043..ddaed75315 100755
--- a/tools/ci_testing/addons_gpu.sh
+++ b/tools/ci_testing/addons_gpu.sh
@@ -25,7 +25,7 @@ fi
 
 set -x
 
-N_JOBS=$(grep -c ^processor /proc/cpuinfo)
+N_JOBS=1 # Must limit GPU testing to single job to prevent OOM error.
 
 echo ""
 echo "Bazel will use ${N_JOBS} concurrent job(s)."