diff --git a/klippy/extras/z_tilt.py b/klippy/extras/z_tilt.py
index af8761d59..0b1b37d1e 100644
--- a/klippy/extras/z_tilt.py
+++ b/klippy/extras/z_tilt.py
@@ -83,7 +83,10 @@ def __init__(self, printer):
         )
 
     def check_retry_result(self, retry_result):
-        if (retry_result and retry_result.isdigit() and int(retry_result) == 0) or retry_result == "done":
+        if retry_result and (
+            (isinstance(retry_result, str) and retry_result == "done")
+            or (isinstance(retry_result, float) and int(retry_result) == 0)
+        ):
             self.applied = True
         return retry_result
 
diff --git a/klippy/extras/z_tilt_ng.py b/klippy/extras/z_tilt_ng.py
index cd2f562e1..be9972b82 100644
--- a/klippy/extras/z_tilt_ng.py
+++ b/klippy/extras/z_tilt_ng.py
@@ -105,7 +105,10 @@ def __init__(self, printer):
         )
 
     def check_retry_result(self, retry_result):
-        if (retry_result and retry_result.isdigit() and int(retry_result) == 0) or retry_result == "done":
+        if retry_result and (
+            (isinstance(retry_result, str) and retry_result == "done")
+            or (isinstance(retry_result, float) and int(retry_result) == 0)
+        ):
             self.applied = True
         return retry_result