diff --git a/Code/Mantid/Framework/Algorithms/src/ReflectometryReductionOneAuto.cpp b/Code/Mantid/Framework/Algorithms/src/ReflectometryReductionOneAuto.cpp
index 560f9ac6a5b1..abfd829d2cd3 100644
--- a/Code/Mantid/Framework/Algorithms/src/ReflectometryReductionOneAuto.cpp
+++ b/Code/Mantid/Framework/Algorithms/src/ReflectometryReductionOneAuto.cpp
@@ -138,7 +138,7 @@ namespace Mantid
           else
           {
             //Otherwise, we create a range.
-            processing_commands = boost::lexical_cast<std::string>(detStart) + ":" + boost::lexical_cast<std::string>(detStop);
+            processing_commands = boost::lexical_cast<std::string>(detStart) + "-" + boost::lexical_cast<std::string>(detStop);
           }
         }
         else
diff --git a/Code/Mantid/Framework/Algorithms/test/ReflectometryReductionOneAutoTest.h b/Code/Mantid/Framework/Algorithms/test/ReflectometryReductionOneAutoTest.h
index bcbef47502ae..fd16133be9c5 100644
--- a/Code/Mantid/Framework/Algorithms/test/ReflectometryReductionOneAutoTest.h
+++ b/Code/Mantid/Framework/Algorithms/test/ReflectometryReductionOneAutoTest.h
@@ -349,7 +349,7 @@ class ReflectometryReductionOneAutoTest: public CxxTest::TestSuite
     std::string processingInstructions = findPropertyValue<std::string>(vecPropertyHistories,
         "ProcessingInstructions");
     std::vector<std::string> pointDetectorStartStop;
-    boost::split(pointDetectorStartStop, processingInstructions, boost::is_any_of(":"));
+    boost::split(pointDetectorStartStop, processingInstructions, boost::is_any_of("-"));
 
     TS_ASSERT_EQUALS(inst->getNumberParameter("LambdaMin")[0], wavelengthMin);
     TS_ASSERT_EQUALS(inst->getNumberParameter("LambdaMax")[0], wavelengthMax);