diff --git a/openscad.spec b/openscad.spec
index eeb4746..d60ab50 100644
--- a/openscad.spec
+++ b/openscad.spec
@@ -42,15 +42,15 @@ movies.
 
 %build
 %if 0%{?suse_version}
-qmake
+qmake PREFIX=%{_prefix}
 %endif
 %if 0%{?fedora_version}
-qmake-qt4
+qmake-qt4 PREFIX=%{_prefix}
 %endif
-make %{?_smp_mflags} PREFIX=%{_prefix}
+make %{?_smp_mflags}
 
 %install
-make INSTALL_ROOT=%{buildroot} PREFIX=%{_prefix} install
+make INSTALL_ROOT=%{buildroot} install
 
 %clean
 rm -rf %{buildroot}