diff --git a/fboss/lib/asic_config_v2/run-helper.sh b/fboss/lib/asic_config_v2/run-helper.sh
index 80ba38234ea30..02491b608cb6e 100755
--- a/fboss/lib/asic_config_v2/run-helper.sh
+++ b/fboss/lib/asic_config_v2/run-helper.sh
@@ -1,2 +1,5 @@
 #!/bin/bash
-python3 fboss/lib/oss/run-helper.py --target fboss-asic-config-gen "$@"
+python3 fboss/lib/oss/run-helper.py \
+  --target fboss-asic-config-gen.GEN_PY_EXE \
+  --extra-cmake-defines='{"RANGE_V3_TESTS": "OFF"}' \
+  "$@"
diff --git a/fboss/lib/oss/run-helper.py b/fboss/lib/oss/run-helper.py
index d271185e3752a..b12982dfeb4af 100644
--- a/fboss/lib/oss/run-helper.py
+++ b/fboss/lib/oss/run-helper.py
@@ -13,25 +13,36 @@
 """
 
 import argparse
+import json
 import os
 import subprocess
 import sys
 from pathlib import Path
-from typing import List, Tuple
 
 
-def get_command_line_args() -> Tuple[str, List[str]]:
+def get_command_line_args() -> tuple[str, dict[str, str], list[str]]:
     parser = argparse.ArgumentParser(
         description="OSS FBOSS build and run helper script."
     )
     parser.add_argument("--target", type=str, required=True, help="Target to build")
+    parser.add_argument(
+        "--extra-cmake-defines",
+        type=str,
+        default="{}",
+        help=("JSON object of additional cmake defines"),
+    )
     args, unknown_args = parser.parse_known_args()
 
-    return args.target, unknown_args
+    extra_defines = json.loads(args.extra_cmake_defines)
+    if not isinstance(extra_defines, dict):
+        print("--extra-cmake-defines must be a JSON object", file=sys.stderr)
+        sys.exit(1)
+
+    return args.target, extra_defines, unknown_args
 
 
 def main() -> None:
-    target, command_line_args = get_command_line_args()
+    target, extra_cmake_defines, command_line_args = get_command_line_args()
 
     run_path = os.getcwd()
     parents = Path(__file__).parents
@@ -40,14 +51,14 @@ def main() -> None:
             "Please run the script from the root of the FBOSS repository",
             file=sys.stderr,
         )
-        exit(1)
+        sys.exit(1)
     expected_path = parents[3].absolute().as_posix()
     if run_path != expected_path:
         error_string = f"""Please executed the script from the root of the FBOSS repository
 Expected run path: {expected_path}
 Current run path: {run_path}"""
         print(error_string, file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
     get_deps_paths = [
         expected_path + "/opensource/fbcode_builder/getdeps.py",
@@ -60,7 +71,7 @@ def main() -> None:
             get_deps_path = maybe_path
     if get_deps_path is None:
         print("Could not find getdeps.py", file=sys.stderr)
-        exit(1)
+        sys.exit(1)
     else:
         print(get_deps_path)
 
@@ -70,11 +81,16 @@ def main() -> None:
     if is_facebook_machine:
         get_deps_path = f"{proxy_env_vars} {get_deps_path}"
 
+    cmake_defines = {"CMAKE_BUILD_TYPE": "MinSizeRel", "CMAKE_CXX_STANDARD": "20"}
+    cmake_defines.update(extra_cmake_defines)
+    cmake_defines_json = json.dumps(cmake_defines)
+
     print(f"Starting build for {target}")
     subprocess.run(
         f"""{get_deps_path} build """
-        + '--allow-system-packages --num-jobs 32 --extra-cmake-defines=\'{"CMAKE_BUILD_TYPE": "MinSizeRel", "CMAKE_CXX_STANDARD": "20"}\' --cmake-target'
+        + f"--allow-system-packages --num-jobs 32 --extra-cmake-defines='{cmake_defines_json}' --cmake-target"
         + f" {target} fboss",
+        check=False,
         shell=True,
     )
 
@@ -82,29 +98,32 @@ def main() -> None:
 
     show_build_dir_proc = subprocess.run(
         f"""{get_deps_path} show-build-dir fboss""",
+        check=False,
         shell=True,
         capture_output=True,
         text=True,
     )
 
-    fboss_oss_target = (
-        show_build_dir_proc.stdout.rstrip()
-        + f"/{target}"
-        + " "
-        + " ".join(command_line_args)
-    )
+    build_dir = show_build_dir_proc.stdout.rstrip()
+    target_basename = target.removesuffix(".GEN_PY_EXE")
+    output_path = f"{build_dir}/{target_basename}"
+
+    # Thrift python output is a directory; everything else is a native executable
+    python_prefix = "python3 " if os.path.isdir(output_path) else ""
+    fboss_oss_target = f"{python_prefix}{output_path} {' '.join(command_line_args)}"
 
     result = subprocess.run(
         fboss_oss_target,
+        check=False,
         shell=True,
     )
 
     if result.returncode != 0:
         print(f"Failed to run target {target}", file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
     print("Configs have been written to specified output directory")
-    exit(0)
+    sys.exit(0)
 
 
 if __name__ == "__main__":