diff --git a/tools/gbench/util.py b/tools/gbench/util.py
index d49018a59e..cec01581b6 100644
--- a/tools/gbench/util.py
+++ b/tools/gbench/util.py
@@ -135,6 +135,12 @@ def benchmark_wanted(benchmark):
 
     with open(fname, "r") as f:
         results = json.load(f)
+        if "context" in results:
+            if "json_schema_version" in results["context"]:
+                json_schema_version = results["context"]["json_schema_version"]
+                if json_schema_version != 1:
+                    print("In %s, got unnsupported JSON schema version: %i, expected 1" % (fname, json_schema_version))
+                    sys.exit(1)
         if "benchmarks" in results:
             results["benchmarks"] = list(
                 filter(benchmark_wanted, results["benchmarks"])