diff --git a/helix.spec b/helix.spec
index 050beae..53116cc 100644
--- a/helix.spec
+++ b/helix.spec
@@ -93,8 +93,9 @@ sed -e '/^\#\!\/usr\/bin\/env .*/d' -i contrib/completion/hx.*
 
 %build
 export HELIX_DISABLE_AUTO_GRAMMAR_BUILD=true
+export HELIX_RUNTIME="%{_builddir}/%{name}-%{version}/runtime"
 %{cargo_build}
-HELIX_RUNTIME="$PWD/runtime" ./target/release/hx --grammar build
+./target/release/hx --grammar build
 
 # Shell completions
 sed -i "s|hx|helix|g" contrib/completion/hx.*