diff --git a/scripts/run_vim.sh b/scripts/run_vim.sh
index 9bc0ac4..1477636 100644
--- a/scripts/run_vim.sh
+++ b/scripts/run_vim.sh
@@ -1,5 +1,9 @@
 #!/bin/sh
 
+if [ "$VIM_TESTBED_DEBUG" = 1 ]; then
+  set -x
+fi
+
 BIN=$1
 shift