diff --git a/packaging/obs_rpm/gsmartcontrol.spec b/packaging/obs_rpm/gsmartcontrol.spec
index 2bbd002..d911d5d 100644
--- a/packaging/obs_rpm/gsmartcontrol.spec
+++ b/packaging/obs_rpm/gsmartcontrol.spec
@@ -60,7 +60,7 @@ on it.
 %build
 %cmake \
 	-DAPP_COMPILER_ENABLE_WARNINGS=ON \
-	-DCMAKE_INSTALL_DOCDIR="%_defaultdocdir"
+	-DCMAKE_INSTALL_DOCDIR=%{_defaultdocdir}
 %cmake_build
 
 %install