diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index d65f2085fedb3b..1cd46477f5a9cc 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -138,7 +138,7 @@ jobs:
             -I../src \
             -I.ext/include/x86_64-linux \
             -Wl,--verbose,--compress-debug-sections=zlib \
-            -Wl,--rpath=$(MMTK_BUILD_PATH) \
+            -Wl,--rpath=$MMTK_BUILD_PATH \
             -L$(readlink -f $MMTK_BUILD_PATH) -lmmtk_ruby \
             -fstack-protector-strong \
             -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 \