diff --git a/src/nqrduck_pulseprogrammer/controller.py b/src/nqrduck_pulseprogrammer/controller.py
index eafcf33..73de6c2 100644
--- a/src/nqrduck_pulseprogrammer/controller.py
+++ b/src/nqrduck_pulseprogrammer/controller.py
@@ -2,6 +2,7 @@ import logging
 import json
 import decimal
 from PyQt6.QtCore import pyqtSlot
+from nqrduck.helpers.serializer import DecimalEncoder
 from nqrduck.module.module_controller import ModuleController
 from nqrduck_spectrometer.pulsesequence import PulseSequence
 
@@ -50,7 +51,7 @@ class PulseProgrammerController(ModuleController):
         logger.debug("Saving pulse sequence to %s", path)
         sequence = self.module.model.pulse_sequence.to_json()
         with open(path, "w") as file:
-            file.write(json.dumps(sequence))
+            file.write(json.dumps(sequence, cls=DecimalEncoder))
         
 
     def load_pulse_sequence(self, path):
diff --git a/src/nqrduck_pulseprogrammer/view.py b/src/nqrduck_pulseprogrammer/view.py
index aba0f17..784e025 100644
--- a/src/nqrduck_pulseprogrammer/view.py
+++ b/src/nqrduck_pulseprogrammer/view.py
@@ -426,9 +426,9 @@ class FunctionOptionWidget(QWidget):
     def on_replot_button_clicked(self):
         logger.debug("Replot button clicked")
         # Update the resolution, start_x, end_x and expr lineedits
-        self.function_option.value.resolution = float(self.resolution_lineedit.text())
-        self.function_option.value.start_x = float(self.start_x_lineedit.text())
-        self.function_option.value.end_x = float(self.end_x_lineedit.text())
+        self.function_option.value.resolution = self.resolution_lineedit.text()
+        self.function_option.value.start_x = self.start_x_lineedit.text()
+        self.function_option.value.end_x = self.end_x_lineedit.text()
         try:
             self.function_option.value.expr = self.expr_lineedit.text()
         except SyntaxError: