diff --git a/testsuite/jflex-testsuite-maven-plugin/src/main/java/jflex/maven/plugin/testsuite/TestsuiteUtils.java b/testsuite/jflex-testsuite-maven-plugin/src/main/java/jflex/maven/plugin/testsuite/TestsuiteUtils.java
index 56777ba6c..2e0c99315 100755
--- a/testsuite/jflex-testsuite-maven-plugin/src/main/java/jflex/maven/plugin/testsuite/TestsuiteUtils.java
+++ b/testsuite/jflex-testsuite-maven-plugin/src/main/java/jflex/maven/plugin/testsuite/TestsuiteUtils.java
@@ -5,6 +5,7 @@
 import java.io.FilenameFilter;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
 
@@ -70,6 +71,7 @@ public boolean accept(File f, String name) {
    */
   public static boolean runTests(List<File> tests, File jflexUberJar)
       throws TestFailException, MojoExecutionException, MojoFailureException {
+    Locale.setDefault(Locale.US);
     int successCount = 0;
     int totalCount = 0;