diff --git a/builder/main.py b/builder/main.py
index 642fdb3..a6ca5b0 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -463,7 +463,7 @@ elif upload_protocol in debug_tools:
     openocd_args.extend(
         [
             "-c",
-            "adapter_khz %s" % env.GetProjectOption("debug_speed", "5000"),
+            "adapter speed %s" % env.GetProjectOption("debug_speed", "5000"),
             "-c",
             "program_esp {{$SOURCE}} %s verify"
             % (
diff --git a/platform.py b/platform.py
index c1856e4..4bbf708 100644
--- a/platform.py
+++ b/platform.py
@@ -247,7 +247,7 @@ class Espressif32Platform(PlatformBase):
 
         if "openocd" in (debug_config.server or {}).get("executable", ""):
             debug_config.server["arguments"].extend(
-                ["-c", "adapter_khz %s" % (debug_config.speed or "5000")]
+                ["-c", "adapter speed %s" % (debug_config.speed or "5000")]
             )
 
         ignore_conds = [