diff --git a/repos/libports/lib/symbols/qt5_component b/repos/libports/lib/symbols/qt5_component
index df6c65967f..1cca0cd631 100644
--- a/repos/libports/lib/symbols/qt5_component
+++ b/repos/libports/lib/symbols/qt5_component
@@ -1 +1,7 @@
 _ZN4Libc9Component9constructERNS_3EnvE T
+#
+# Make sure there is an undefined reference to "main". Because Qt5 apps don't
+# link the posix library (where main is also undefined), we need this so "main"
+# does not get garbage collected during linking.
+#
+main U