diff --git a/integration-tests/checkstyle-10.12.4.sh b/integration-tests/checkstyle-10.12.4.sh
index c699aacf1b1..082dc0cb17f 100755
--- a/integration-tests/checkstyle-10.12.4.sh
+++ b/integration-tests/checkstyle-10.12.4.sh
@@ -64,14 +64,14 @@ error_prone_shared_flags='-XepExcludedPaths:(\Q${project.basedir}${file.separato
 error_prone_patch_flags="${error_prone_shared_flags} -XepPatchLocation:IN_PLACE -XepPatchChecks:$(
   find "${error_prone_support_root}" -path "*/META-INF/services/com.google.errorprone.bugpatterns.BugChecker" -print0 \
     | xargs -0 ${grep_command} -hoP '[^.]+$' \
-    | paste -s -d ','
+    | paste -s -d ',' -
 )"
 
 error_prone_validation_flags="${error_prone_shared_flags} -XepDisableAllChecks $(
   find "${error_prone_support_root}" -path "*/META-INF/services/com.google.errorprone.bugpatterns.BugChecker" -print0 \
     | xargs -0 ${grep_command} -hoP '[^.]+$' \
     | ${sed_command} -r 's,(.*),-Xep:\1:WARN,' \
-    | paste -s -d ' '
+    | paste -s -d ' ' -
 )"
 
 echo "Shared build flags: ${shared_build_flags}"