diff --git a/run_tests.py b/run_tests.py
index d818757b50..1e01b43656 100755
--- a/run_tests.py
+++ b/run_tests.py
@@ -56,7 +56,7 @@ def is_included(backend):
         run_test(
             filename,
             "ast",
-            "lpython --show-ast --no-color {infile} -o {outfile}",
+            "lpython --show-ast --indent --no-color {infile} -o {outfile}",
             filename,
             update_reference,
             extra_args)
@@ -65,7 +65,7 @@ def is_included(backend):
         run_test(
             filename,
             "ast_new",
-            "lpython --show-ast --new-parser --no-color {infile} -o {outfile}",
+            "lpython --show-ast --indent --new-parser --no-color {infile} -o {outfile}",
             filename,
             update_reference,
             extra_args)
@@ -74,14 +74,14 @@ def is_included(backend):
         run_test(
             filename,
             "asr",
-            "lpython --show-asr --no-color {infile} -o {outfile}",
+            "lpython --show-asr --indent --no-color {infile} -o {outfile}",
             filename,
             update_reference,
             extra_args)
 
     if pass_ is not None:
         cmd = "lpython --pass=" + pass_ + \
-            " --show-asr --no-color {infile} -o {outfile}"
+            " --show-asr --indent --no-color {infile} -o {outfile}"
         run_test(filename, "pass_{}".format(pass_), cmd,
                  filename, update_reference, extra_args)