diff --git a/qt.pri b/qt.pri
index e07bcc78c..e16394278 100644
--- a/qt.pri
+++ b/qt.pri
@@ -3,6 +3,22 @@
 # that can be found in the LICENSE file at the root of the
 # Mumble source tree or at <https://www.mumble.info/LICENSE>.
 
-QT_VERSION = $$[QT_VERSION]
-QT_MAJOR_VERSION = $$section(QT_VERSION, ., 0, 0)
-QT_MINOR_VERSION = $$section(QT_VERSION, ., 1, 1)
+QT_VERSION_INT_MAJOR = $$QT_MAJOR_VERSION
+
+greaterThan(QT_MINOR_VERSION, 99) {
+	error(bad Qt minor version)
+} greaterThan(QT_MINOR_VERSION, 9) {
+	QT_VERSION_INT_MINOR = "$$QT_MINOR_VERSION"
+} else {
+	QT_VERSION_INT_MINOR = "0$$QT_MINOR_VERSION"
+}
+
+greaterThan(QT_PATCH_VERSION, 99) {
+	error(bad Qt patch version)
+} greaterThan(QT_PATCH_VERSION, 9) {
+	QT_VERSION_INT_PATCH = "$$QT_PATCH_VERSION"
+} else {
+	QT_VERSION_INT_PATCH = "0$$QT_PATCH_VERSION"
+}
+
+QT_VERSION_INT = "$$QT_VERSION_INT_MAJOR$$QT_VERSION_INT_MINOR$$QT_VERSION_INT_PATCH"