diff --git a/tests/runtime.bats b/tests/runtime.bats
index e0baac1..fe6763e 100644
--- a/tests/runtime.bats
+++ b/tests/runtime.bats
@@ -9,7 +9,7 @@
 
 @test "build image" {
   cd $BATS_TEST_DIRNAME/..
-  docker build -t $SUT_IMAGE .
+  docker_build -t $SUT_IMAGE .
 }
 
 @test "clean test containers" {