diff --git a/contrib/build-linux/appimage/build.sh b/contrib/build-linux/appimage/build.sh
index 05c52e6b2..7f88f05f8 100755
--- a/contrib/build-linux/appimage/build.sh
+++ b/contrib/build-linux/appimage/build.sh
@@ -57,6 +57,12 @@ tar xf "$CACHEDIR/Python-$PYTHON_VERSION.tar.xz" -C "$BUILDDIR"
       -q
     make -j4 -s
     make -s install > /dev/null
+    # When building in docker on macOS, python builds with .exe extension because the
+    # case insensitive file system of macOS leaks into docker. This causes the build
+    # to result in a different output on macOS compared to Linux. We simply patch
+    # sysconfigdata to remove the extension.
+    # Some more info: https://bugs.python.org/issue27631
+    sed -i -e 's/\.exe//g' "$APPDIR"/usr/lib/python3.6/_sysconfigdata*
 )