diff --git a/java/src/org/broadinstitute/sting/gatk/walkers/beagle/ProduceBeagleInputWalker.java b/java/src/org/broadinstitute/sting/gatk/walkers/beagle/ProduceBeagleInputWalker.java
index 4f83c8dd7..097421734 100755
--- a/java/src/org/broadinstitute/sting/gatk/walkers/beagle/ProduceBeagleInputWalker.java
+++ b/java/src/org/broadinstitute/sting/gatk/walkers/beagle/ProduceBeagleInputWalker.java
@@ -29,7 +29,9 @@ import org.broad.tribble.util.variantcontext.Allele;
 import org.broad.tribble.util.variantcontext.Genotype;
 import org.broad.tribble.util.variantcontext.VariantContext;
 import org.broad.tribble.vcf.VCFConstants;
+import org.broad.tribble.vcf.VCFWriter;
 import org.broadinstitute.sting.commandline.Argument;
+import org.broadinstitute.sting.commandline.Output;
 import org.broadinstitute.sting.gatk.contexts.AlignmentContext;
 import org.broadinstitute.sting.gatk.contexts.ReferenceContext;
 import org.broadinstitute.sting.gatk.contexts.variantcontext.VariantContextUtils;
@@ -52,8 +54,9 @@ public class ProduceBeagleInputWalker extends RodWalker<Integer, Integer> {
 
     public static final String ROD_NAME = "variant";
 
-    @Argument(fullName = "beagle_file", shortName = "beagle", doc = "File to print BEAGLE-specific data for use with imputation", required = true)
-    public PrintStream  beagleWriter = null;
+    @Output(doc="File to which BEAGLE input should be written",required=true)
+    protected PrintStream  beagleWriter = null;
+
     @Argument(fullName = "genotypes_file", shortName = "genotypes", doc = "File to print reference genotypes for error analysis", required = false)
     public PrintStream beagleGenotypesWriter  = null;
     @Argument(fullName = "inserted_nocall_rate", shortName = "nc_rate", doc = "Rate (0-1) at which genotype no-calls will be randomly inserted, for testing", required = false)
diff --git a/java/test/org/broadinstitute/sting/gatk/walkers/beagle/BeagleIntegrationTest.java b/java/test/org/broadinstitute/sting/gatk/walkers/beagle/BeagleIntegrationTest.java
index 0238d8dd5..563da06d6 100755
--- a/java/test/org/broadinstitute/sting/gatk/walkers/beagle/BeagleIntegrationTest.java
+++ b/java/test/org/broadinstitute/sting/gatk/walkers/beagle/BeagleIntegrationTest.java
@@ -50,7 +50,7 @@ public class BeagleIntegrationTest extends WalkerTest {
         WalkerTestSpec spec = new WalkerTestSpec(
                 "-T ProduceBeagleInput -R " + hg19Reference + " " +
                         "-B:variant,VCF " + beagleValidationDataLocation + "inttestbgl.input.vcf " +
-                         "-beagle %s", 1, Arrays.asList("c0d30e5dbe903874f8422a0e63a5118e"));
+                         "-o %s", 1, Arrays.asList("c0d30e5dbe903874f8422a0e63a5118e"));
         executeTest("test BeagleInput", spec);
     }