diff --git a/pkgs/by-name/st/stm32cubemx/package.nix b/pkgs/by-name/st/stm32cubemx/package.nix
index d7966caec68e..bd0250accc8e 100644
--- a/pkgs/by-name/st/stm32cubemx/package.nix
+++ b/pkgs/by-name/st/stm32cubemx/package.nix
@@ -52,6 +52,11 @@ let
 
       cat << EOF > $out/bin/${pname}
       #!${stdenvNoCC.shell}
+      updater_xml="\$HOME/.stm32cubemx/thirdparties/db/updaterThirdParties.xml"
+      if [ -e "\$updater_xml" ] && [ ! -w "\$updater_xml" ]; then
+        echo "Warning: Unwritable \$updater_xml prevents CubeMX software packages from working correctly. Fixing that."
+        (set -x; chmod u+w "\$updater_xml")
+      fi
       ${jdk21}/bin/java -jar $out/opt/STM32CubeMX/STM32CubeMX "\$@"
       EOF
       chmod +x $out/bin/${pname}