diff --git a/expat/qa.sh b/expat/qa.sh
index f745707c..5dd39512 100755
--- a/expat/qa.sh
+++ b/expat/qa.sh
@@ -57,6 +57,11 @@ populate_environment() {
                 # http://clang.llvm.org/docs/AddressSanitizer.html
                 BASE_COMPILE_FLAGS+=" -g -fsanitize=address -fno-omit-frame-pointer -fno-common"
                 BASE_LINK_FLAGS+=" -g -fsanitize=address"
+                # macOS's XCode does not support LeakSanitizer and reports error:
+                # AddressSanitizer: detect_leaks is not supported on this platform.
+                if [[ "$(uname -s)" != Darwin* ]]; then
+                    export ASAN_OPTIONS=detect_leaks=1
+                fi
                 ;;
             memory)
                 # http://clang.llvm.org/docs/MemorySanitizer.html