diff --git a/Framework/DataHandling/src/LoadIsawDetCal.cpp b/Framework/DataHandling/src/LoadIsawDetCal.cpp
index 70fc5025f7b38809d3b6710f51e8d995f3ddbedf..d50874f05929226354563df125deb1de70951b0e 100644
--- a/Framework/DataHandling/src/LoadIsawDetCal.cpp
+++ b/Framework/DataHandling/src/LoadIsawDetCal.cpp
@@ -50,7 +50,7 @@ void LoadIsawDetCal::init() {
                       boost::make_shared<InstrumentValidator>()),
                   "The workspace containing the geometry to be calibrated.");
 
-  const auto exts = std::vector<std::string>({".DetCal"});
+  const auto exts = std::vector<std::string>({".DetCal", ".detcal", ".peaks", ".integrate"});
   declareProperty(
       Kernel::make_unique<API::MultipleFileProperty>("Filename", exts),
       "The input filename of the ISAW DetCal file (Two files "
diff --git a/docs/source/release/v3.14.0/diffraction.rst b/docs/source/release/v3.14.0/diffraction.rst
index b26d90a4528cc052d4ea2e2e62b4b8773fbe8897..fc177a16f4ce1eaad92a3b3c1a64cbb0eb3489fe 100644
--- a/docs/source/release/v3.14.0/diffraction.rst
+++ b/docs/source/release/v3.14.0/diffraction.rst
@@ -48,6 +48,7 @@ Bugfixes
 
 - :ref:`FindPeaksMD <algm-FindPeaksMD>` now finds peaks correctly with the crystallography convention setting and reduction with crystallography convention is tested with a system test.
 - :ref:`SaveIsawPeaks <algm-SaveIsawPeaks>` does not have duplicate peak numbers when saving PeaksWorkspaces with more than one RunNumber.
+- :ref:`LoadIsawPeaks <algm-LoadIsawPeaks>` now loads the calibration from the peaks file correctly.
 
 Powder Diffraction
 ------------------