diff --git a/CHANGELOG.md b/CHANGELOG.md
index c8f705a..0dcb9fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # v1.0.7 (pre-release)
 - Improve chaptered audio generation by outputting directly as `m4b` instead of converting from `wav`.
 - Ignore chapter markers and single newlines when calculating text length, improving the accuracy of the text length calculation.
+- Prevent cancellation if process is at 99%, ensuring the process is not interrupted at the last moment.
 - Added `.opus` as output format for generated audio files.
 - Added "Playing..." indicator for "Preview" button in the voice mixer.
 
diff --git a/abogen/gui.py b/abogen/gui.py
index b7514af..7f1cd1d 100644
--- a/abogen/gui.py
+++ b/abogen/gui.py
@@ -1127,12 +1127,20 @@ class abogen(QWidget):
         QApplication.processEvents()
 
     def update_progress(self, value, etr_str):  # Add etr_str parameter
+        # Ensure progress doesn't exceed 99%
+        if value >= 100:
+            value = 99
         self.progress_bar.setValue(value)
         self.progress_bar.setFormat("%p%")  # Keep format as percentage only
         self.etr_label.setText(
             f"Estimated time remaining: {etr_str}"
         )  # Update ETR label
         self.etr_label.show()  # Show only when estimate is ready
+
+        # Disable cancel button if progress is >= 98%
+        if value >= 98:
+            self.btn_cancel.setEnabled(False)
+
         self.progress_bar.repaint()
         QApplication.processEvents()