diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc8c49a0..9b29d6c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 **1.2.67**
 - Added keyboard shortcuts (press [?] for help).
+- Added range check to the FFT overlap parameter.
 
 **1.2.66**
 - Added bookmark option to enable/disable scanning.
diff --git a/debian/changelog b/debian/changelog
index 89654d8c..708a11b2 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 openwebrx (1.2.67) bullseye jammy; urgency=low
 
   * Added keyboard shortcuts (press [?] for help).
+  * Added range check to the FFT overlap parameter.
 
  -- Marat Fayzullin <luarvique@gmail.com>  Mon, 26 Aug 2024 16:12:00 +0000
 
diff --git a/owrx/controllers/settings/general.py b/owrx/controllers/settings/general.py
index eb2e4608..89db5da3 100644
--- a/owrx/controllers/settings/general.py
+++ b/owrx/controllers/settings/general.py
@@ -161,6 +161,7 @@ class GeneralSettingsController(SettingsFormController):
                     "FFT vertical overlap factor",
                     infotext="If fft_voverlap_factor is above 0, multiple FFTs will be used for creating a line on the "
                     + "diagram.",
+                    validator=RangeValidator(0.0, 0.9),
                 ),
                 WaterfallLevelsInput("waterfall_levels", "Waterfall levels"),
                 WaterfallAutoLevelsInput(
diff --git a/owrx/form/input/__init__.py b/owrx/form/input/__init__.py
index 494ae2f4..f7595eb6 100644
--- a/owrx/form/input/__init__.py
+++ b/owrx/form/input/__init__.py
@@ -161,8 +161,8 @@ class NumberInput(Input):
 
 
 class FloatInput(NumberInput):
-    def __init__(self, id, label, infotext=None, converter: Converter = None):
-        super().__init__(id, label, infotext, converter=converter)
+    def __init__(self, id, label, infotext=None, converter: Converter = None, validator: Validator = None):
+        super().__init__(id, label, infotext, converter=converter, validator=validator)
         self.step = "any"
 
     def defaultConverter(self):
diff --git a/owrx/form/input/validator.py b/owrx/form/input/validator.py
index bda4304d..462ec221 100644
--- a/owrx/form/input/validator.py
+++ b/owrx/form/input/validator.py
@@ -16,7 +16,7 @@ class RequiredValidator(Validator):
 
 
 class Range(object):
-    def __init__(self, start: int, end: int = None):
+    def __init__(self, start, end = None):
         self.start = start
         self.end = end if end is not None else start