diff --git a/GNUmakefile b/GNUmakefile
index 8cdfaa3e..9cab84bd 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -72,7 +72,7 @@ test: fmtcheck
 		xargs -t -n4 go test $(TESTARGS) -timeout=30s -parallel=4
 
 testacc: fmtcheck
-	TF_ACC_TERRAFORM_CACHE_DIR=/tmp TF_ACC_TERRAFORM_VERSION=1.1.7 TF_LOG=DEBUG TF_ACC=1 go test $(TEST) -v $(TESTARGS) -timeout 120m
+	TF_ACC_TERRAFORM_CACHE_DIR=/tmp TF_ACC_TERRAFORM_VERSION=1.1.7 TF_LOG=DEBUG TF_ACC=1 go test $(TEST) -v -json $(TESTARGS) -timeout 120m
 
 vet:
 	@echo "go vet ."