diff --git a/src/utilities/xml/XMLValidator.cpp b/src/utilities/xml/XMLValidator.cpp
index daa458496a..46964a8d29 100644
--- a/src/utilities/xml/XMLValidator.cpp
+++ b/src/utilities/xml/XMLValidator.cpp
@@ -73,7 +73,7 @@ openstudio::path XMLValidator::schematronToXslt(const openstudio::path& schemaPa
 
   // This replicates what happens when you do:
   // from lxml.isoschematron import Schematron;
-  // s = Schematron(file='schematron.sct', store_xslt=True)
+  // s = Schematron(file='schematron.sch', store_xslt=True)
   // with open('schematron.xslt', 'w') as f:
   //     f.write(str(s._validator_xslt))
 
@@ -170,7 +170,7 @@ XMLValidator::XMLValidator(const openstudio::path& schemaPath) : m_schemaPath(op
   } else if (schemaPath.extension() == ".xslt") {
     m_validatorType = XMLValidatorType::XSLTSchematron;
     logAndStore(Trace, "Treating schema as a XLST StyleSheet that derives from a Schematron.");
-  } else if ((schemaPath.extension() == ".xml") || (schemaPath.extension() == ".sct")) {
+  } else if ((schemaPath.extension() == ".xml") || (schemaPath.extension() == ".sch")) {
     m_validatorType = XMLValidatorType::Schematron;
     logAndStore(Trace, "Treating schema as a Schematron, converting to an XSLT StyleSheet.");
     // Let's use a temporary directory for this, so we avoid having two instances trying to write to the same file and we avoid issues where the
@@ -262,7 +262,7 @@ bool XMLValidator::validate(const openstudio::path& xmlPath) {
     LOG_AND_THROW(logMessage);
   }
 
-  if (xmlPath.extension() == ".xml") {
+  if (xmlPath.extension() == ".xml" || xmlPath.extension() == ".sch" || xmlPath.extension() == ".xsd") {
     auto t_xmlPath = openstudio::filesystem::system_complete(xmlPath);
     m_xmlPath = t_xmlPath;
   } else {
diff --git a/src/utilities/xml/XMLValidator.hpp b/src/utilities/xml/XMLValidator.hpp
index 6296523e31..a8ccd7c2ae 100644
--- a/src/utilities/xml/XMLValidator.hpp
+++ b/src/utilities/xml/XMLValidator.hpp
@@ -43,7 +43,7 @@ class UTILITIES_API XMLValidator
    *
    * The schemaPath extension is used to determine the type of validation to perform:
    * - `*.xsd` => XSD
-   * - `*.xml` or `*.sct` => Schematron (convert to XSLT then validate)
+   * - `*.xml` or `*.sch` => Schematron (convert to XSLT then validate)
    * - `*.xslt` => Schematron that is already transformed to an XSLT stylesheet */
   explicit XMLValidator(const openstudio::path& schemaPath);
   ~XMLValidator();