diff --git a/docs/Config_Reference.md b/docs/Config_Reference.md
index f19f0ebc1729..e4c70937583f 100644
--- a/docs/Config_Reference.md
+++ b/docs/Config_Reference.md
@@ -2458,6 +2458,10 @@ postfix for both sections.
 #   "calibration_extruder_temp" option is set.  Its recommended to heat
 #   the extruder some distance from the bed to minimize its impact on
 #   the probe coil temperature.  The default is 50.
+#max_validation_temp: 60.
+#   The maximum temperature used to validate the calibration.  It is
+#   recommended to set this to a value between 100 and 120 for enclosed
+#   printers.  The default is 60.
 ```
 
 ## Temperature sensors
diff --git a/docs/Eddy_Probe.md b/docs/Eddy_Probe.md
index 5fa7fc4d30b7..3c36a613c181 100644
--- a/docs/Eddy_Probe.md
+++ b/docs/Eddy_Probe.md
@@ -78,7 +78,9 @@ for further details on how to configure a `temperature_probe`.  It is
 advised to configure the `calibration_position`,
 `calibration_extruder_temp`, `extruder_heating_z`, and
 `calibration_bed_temp` options, as doing so will automate some of the
-steps outlined below.
+steps outlined below.  If the printer to be calibrated is enclosed, it
+is strongly recommended to set the `max_validation_temp` option to a value
+between 100 and 120.
 
 Eddy probe manufacturers may offer a stock drift calibration that can be
 manually added to `drift_calibration` option of the `[probe_eddy_current]`
diff --git a/klippy/extras/temperature_probe.py b/klippy/extras/temperature_probe.py
index ae285ce36291..05eac34ef984 100644
--- a/klippy/extras/temperature_probe.py
+++ b/klippy/extras/temperature_probe.py
@@ -490,6 +490,7 @@ def __init__(self, config, sensor):
         self.cal_temp = config.getfloat("calibration_temp", 0.)
         self.drift_calibration = None
         self.calibration_samples = None
+        self.max_valid_temp = config.getfloat("max_validation_temp", 60.)
         self.dc_min_temp = config.getfloat("drift_calibration_min_temp", 0.)
         dc = config.getlists(
             "drift_calibration", None, seps=(',', '\n'), parser=float
@@ -503,7 +504,8 @@ def __init__(self, config, sensor):
                     )
             self.drift_calibration = [Polynomial2d(*coefs) for coefs in dc]
             cal = self.drift_calibration
-            self._check_calibration(cal, self.dc_min_temp, config.error)
+            start_temp, end_temp = self.dc_min_temp, self.max_valid_temp
+            self._check_calibration(cal, start_temp, end_temp, config.error)
             low_poly = self.drift_calibration[-1]
             self.min_freq = min([low_poly(temp) for temp in range(121)])
             cal_str = "\n".join([repr(p) for p in cal])
@@ -638,13 +640,15 @@ def finish_calibration(self, success):
                 "calbration error, not enough samples"
             )
         min_temp, _ = cal_samples[0][0]
+        max_temp, _ = cal_samples[-1][0]
         polynomials = []
         for i, coords in enumerate(cal_samples):
             height = .05 + i * .5
             poly = Polynomial2d.fit(coords)
             polynomials.append(poly)
             logging.info("Polynomial at Z=%.2f: %s" % (height, repr(poly)))
-        self._check_calibration(polynomials, min_temp)
+        end_vld_temp = max(self.max_valid_temp, max_temp)
+        self._check_calibration(polynomials, min_temp, end_vld_temp)
         coef_cfg = "\n" + "\n".join([str(p) for p in polynomials])
         configfile = self.printer.lookup_object('configfile')
         configfile.set(self.name, "drift_calibration", coef_cfg)
@@ -656,10 +660,11 @@ def finish_calibration(self, success):
             % (self.name, len(polynomials))
         )
 
-    def _check_calibration(self, calibration, start_temp, error=None):
+    def _check_calibration(self, calibration, start_temp, end_temp, error=None):
         error = error or self.printer.command_error
         start = int(start_temp)
-        for temp in range(start, 121, 1):
+        end = int(end_temp) + 1
+        for temp in range(start, end, 1):
             last_freq = calibration[0](temp)
             for i, poly in enumerate(calibration[1:]):
                 next_freq = poly(temp)
diff --git a/src/stm32/stm32g4.c b/src/stm32/stm32g4.c
index 1eed3ec188d6..5255cb19a490 100644
--- a/src/stm32/stm32g4.c
+++ b/src/stm32/stm32g4.c
@@ -104,7 +104,7 @@ enable_clock_stm32g4(void)
     RCC->CR |= RCC_CR_PLLON;
 
     // Enable 48Mhz USB clock using clock recovery
-    if (CONFIG_USBSERIAL) {
+    if (CONFIG_USB) {
         RCC->CRRCR |= RCC_CRRCR_HSI48ON;
         while (!(RCC->CRRCR & RCC_CRRCR_HSI48RDY))
             ;
diff --git a/src/stm32/stm32l4.c b/src/stm32/stm32l4.c
index 7db15fff0ba2..ae099d6bc6a5 100644
--- a/src/stm32/stm32l4.c
+++ b/src/stm32/stm32l4.c
@@ -96,7 +96,7 @@ enable_clock_stm32l4(void)
     RCC->CR |= RCC_CR_PLLON;
 
     // Enable 48Mhz USB clock using clock recovery
-    if (CONFIG_USBSERIAL) {
+    if (CONFIG_USB) {
         RCC->CRRCR |= RCC_CRRCR_HSI48ON;
         while (!(RCC->CRRCR & RCC_CRRCR_HSI48RDY))
             ;