diff --git a/proxyface.spec.in b/proxyface.spec.in
index 06cb064..5f4728d 100644
--- a/proxyface.spec.in
+++ b/proxyface.spec.in
@@ -23,7 +23,7 @@ This package contains only the shared libraries required at runtime.
 %prep
 %setup -q
 function checkqt() {
-    which /usr/bin/$1 || /usr/bin/$1-qt5 || /usr/bin/$1-qt4
+    ( which /usr/bin/$1 || which /usr/bin/$1-qt5 || which /usr/bin/$1-qt4 ) 2>/dev/null
 }
 MOC="$(checkqt moc)" UIC="$(checkqt uic)" RCC="$(checkqt rcc)" \
     LUPDATE="$(checkqt lupdate)" LRELEASE="$(checkqt lrelease)" \