diff --git a/ci/x86_64-linux-release.sh b/ci/x86_64-linux-release.sh
index 0fbccca8d3291869b1d68e461417053524b2b109..64c6589fba220c76e25e9d80f950efc97f777df4 100755
--- a/ci/x86_64-linux-release.sh
+++ b/ci/x86_64-linux-release.sh
@@ -48,7 +48,7 @@ unset CXX
 
 ninja install
 
-# Must be done after zig cc is finished.
+# Must not be set while using the other `zig cc` which has its own zig lib dir.
 export ZIG_LIB_DIR="$PWD/../lib"
 
 # Covers several things:
@@ -99,6 +99,7 @@ cd ../build-new
 
 export CC="$ZIG cc -target $TARGET -mcpu=$MCPU"
 export CXX="$ZIG c++ -target $TARGET -mcpu=$MCPU"
+unset ZIG_LIB_DIR
 
 cmake .. \
   -DCMAKE_PREFIX_PATH="$PREFIX" \
@@ -117,6 +118,8 @@ unset CXX
 
 ninja install
 
+export ZIG_LIB_DIR="$PWD/../lib"
+
 stage3/bin/zig test ../test/behavior.zig
 stage3/bin/zig build -p stage4 \
   -Dstatic-llvm \