diff --git a/.ci/travis/checkstyle_regression_no_exception.sh b/.ci/travis/checkstyle_regression_no_exception.sh
index fed3acb..f2949c3 100755
--- a/.ci/travis/checkstyle_regression_no_exception.sh
+++ b/.ci/travis/checkstyle_regression_no_exception.sh
@@ -24,7 +24,7 @@ git checkout master
 git reset --hard "${MASTER_COMMIT}"
 cd ..
 mvn clean package -Passembly
-java -jar target/regression-tool-1.0-SNAPSHOT-all.jar -r "$CHECKSTYLE_PATH" -p test-branch -t contribution/checkstyle-tester
+java -Xms1024m -Xmx2048m -jar target/regression-tool-1.0-SNAPSHOT-all.jar -r "$CHECKSTYLE_PATH" -p test-branch -t contribution/checkstyle-tester
 RESULT="$?"
 cat config-test-branch-*.xml
 rm config-test-branch-*.xml
diff --git a/.travis.yml b/.travis.yml
index 8c48d22..312bf10 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -74,13 +74,13 @@ matrix:
     - jdk: oraclejdk8
       env:
         - DESC="checkstyle regression no exception on latest commit"
-        - CMD="./.ci/travis/checkstyle_regression_no_exception.sh HEAD HEAD^"
+        - CMD="export MAVEN_OPTS='-Xmx2000m' && export JAVA_OPTS='-Xmx2000m' && ./.ci/travis/checkstyle_regression_no_exception.sh HEAD HEAD^"
 
     # checkstyle regression no exception, changes to check (oraclejdk8)
     - jdk: oraclejdk8
       env:
         - DESC="checkstyle regression no exception, changes to check"
-        - CMD="./.ci/travis/checkstyle_regression_no_exception.sh f0ed29b d2e0c4c 8.5-SNAPSHOT"
+        - CMD="export MAVEN_OPTS='-Xmx2000m' && export JAVA_OPTS='-Xmx2000m' && ./.ci/travis/checkstyle_regression_no_exception.sh f0ed29b d2e0c4c 8.5-SNAPSHOT"
 
 script: eval $CMD