diff --git a/tools/ci/compile.sh b/tools/ci/compile.sh
index ee4ba13d940a5..0603e7b7e48b3 100755
--- a/tools/ci/compile.sh
+++ b/tools/ci/compile.sh
@@ -58,8 +58,9 @@ echo "==========================================================================
 
 EXIT_CODE=0
 
+# run with -T1 because our maven output parsers don't support multi-threaded builds
 $MVN clean deploy -DaltDeploymentRepository=validation_repository::default::file:$MVN_VALIDATION_DIR -Dflink.convergence.phase=install -Pcheck-convergence \
-    -Dmaven.javadoc.skip=true -U -DskipTests "${@}" | tee $MVN_CLEAN_COMPILE_OUT
+    -Dmaven.javadoc.skip=true -U -DskipTests "${@}" -T1 | tee $MVN_CLEAN_COMPILE_OUT
 
 EXIT_CODE=${PIPESTATUS[0]}
 
diff --git a/tools/ci/verify_bundled_optional.sh b/tools/ci/verify_bundled_optional.sh
index 276d95eb63403..e0f5a22255da0 100755
--- a/tools/ci/verify_bundled_optional.sh
+++ b/tools/ci/verify_bundled_optional.sh
@@ -48,7 +48,8 @@ MVN=${MVN:-./mvnw}
 
 dependency_plugin_output=/tmp/optional_dep.txt
 
-$MVN dependency:tree -B > "${dependency_plugin_output}"
+# run with -T1 because our maven output parsers don't support multi-threaded builds
+$MVN dependency:tree -B -T1 > "${dependency_plugin_output}"
 EXIT_CODE=$?
 
 if [ $EXIT_CODE != 0 ]; then
diff --git a/tools/ci/verify_scala_suffixes.sh b/tools/ci/verify_scala_suffixes.sh
index 9747066b4c8b0..f6aae040731ea 100755
--- a/tools/ci/verify_scala_suffixes.sh
+++ b/tools/ci/verify_scala_suffixes.sh
@@ -63,7 +63,8 @@ echo "If you haven't built the project, please do so first by running \"mvn clea
 
 dependency_plugin_output=/tmp/dep.txt
 
-$MVN dependency:tree -Dincludes=org.scala-lang,:*_2.1*:: ${MAVEN_ARGUMENTS} > "${dependency_plugin_output}"
+# run with -T1 because our maven output parsers don't support multi-threaded builds
+$MVN dependency:tree -Dincludes=org.scala-lang,:*_2.1*:: ${MAVEN_ARGUMENTS} -T1 > "${dependency_plugin_output}"
 EXIT_CODE=$?
 
 if [ $EXIT_CODE != 0 ]; then