diff --git a/Makefile.am b/Makefile.am
index 51d19fba..ad4e6180 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1332,6 +1332,7 @@ EXTRA_DIST = \
 	src/common/windows/pdb_source_line_writer.h \
 	src/common/windows/string_utils-inl.h \
 	src/common/windows/string_utils.cc \
+	src/processor/microdump_stackwalk_test_vars \
 	src/processor/stackwalk_common.cc \
 	src/processor/stackwalk_common.h \
 	src/processor/stackwalker_selftest_sol.s \
diff --git a/Makefile.in b/Makefile.in
index 6a5e56b0..c728e593 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -3183,6 +3183,7 @@ EXTRA_DIST = \
 	src/common/windows/pdb_source_line_writer.h \
 	src/common/windows/string_utils-inl.h \
 	src/common/windows/string_utils.cc \
+	src/processor/microdump_stackwalk_test_vars \
 	src/processor/stackwalk_common.cc \
 	src/processor/stackwalk_common.h \
 	src/processor/stackwalker_selftest_sol.s \
diff --git a/src/processor/microdump_stackwalk_machine_readable_test b/src/processor/microdump_stackwalk_machine_readable_test
index fadec264..f5614e20 100755
--- a/src/processor/microdump_stackwalk_machine_readable_test
+++ b/src/processor/microdump_stackwalk_machine_readable_test
@@ -29,7 +29,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-source "${0%/*}/microdump_stackwalk_test_vars"  # for MICRODUMP_SUPPORTED_ARCHS.
+. "${0%/*}/microdump_stackwalk_test_vars" || exit 1  # for MICRODUMP_SUPPORTED_ARCHS.
 testdata_dir=$srcdir/src/processor/testdata
 
 set -e  # Bail out with an error if any of the commands below fails.
diff --git a/src/processor/microdump_stackwalk_test b/src/processor/microdump_stackwalk_test
index 5a1f3d59..e1897656 100755
--- a/src/processor/microdump_stackwalk_test
+++ b/src/processor/microdump_stackwalk_test
@@ -29,7 +29,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-source "${0%/*}/microdump_stackwalk_test_vars"  # for MICRODUMP_SUPPORTED_ARCHS.
+. "${0%/*}/microdump_stackwalk_test_vars" || exit 1  # for MICRODUMP_SUPPORTED_ARCHS.
 testdata_dir=$srcdir/src/processor/testdata
 
 set -e  # Bail out with an error if any of the commands below fails.