diff --git a/ci/scripts/build.sh b/ci/scripts/build.sh
index 40bad6a..7d49417 100755
--- a/ci/scripts/build.sh
+++ b/ci/scripts/build.sh
@@ -15,5 +15,5 @@ cmake \
   -DSNMALLOC_QEMU_WORKAROUND=ON \
   -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
   -DCMAKE_CXX_FLAGS="$CMAKE_CXX_FLAGS" \
-  ..
+  ${SNMALLOC_SRC-..}
 ninja
\ No newline at end of file