diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index aa58c0502a80c2..ef0752ddc09d11 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -136,12 +136,12 @@ jobs:
             -I../src \
             -I.ext/include/x86_64-linux \
             -Wl,--verbose,--compress-debug-sections=zlib \
-            -Wl,--rpath=../src/gc/mmtk/target/release
-            -L../src/gc/mmtk/target/release -lmmtk_ruby \
+            -Wl,--rpath=$(pwd)/../src/gc/mmtk/target/release
+            -L$(pwd)/../src/gc/mmtk/target/release -lmmtk_ruby \
             -fstack-protector-strong \
             -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 \
             -O3 -fno-fast-math -ggdb3 -DBUILDING_SHARED_GC -fPIC \
-            -o /home/runner/ruby_gc/librubygc.mmtk.so ../src/gc/mmtk.c &&
+            -o /home/runner/ruby_gc/librubygc.mmtk.so $(pwd)/../src/gc/mmtk.c &&
           ldd ${{ matrix.shared_gc_dir }}/librubygc.mmtk.so
         if: ${{ matrix.shared_gc }}