diff --git a/Code/Mantid/Framework/PostInstall/CMakeLists.txt b/Code/Mantid/Framework/PostInstall/CMakeLists.txt
index 676eb6bf5ecab7ee9c88707c93bece64e36cd6ac..46d87820397732d53bdd9b394f9cebe443e11e9b 100644
--- a/Code/Mantid/Framework/PostInstall/CMakeLists.txt
+++ b/Code/Mantid/Framework/PostInstall/CMakeLists.txt
@@ -18,6 +18,6 @@ set ( PACKAGE_ROOT \$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX} )
 set ( EXCLUDE_REGEX ".*_template|.*port_v3" )
 
 set ( COMPILE_SCRIPT "message ( \"Byte-compiling Python in ${PACKAGE_ROOT}\")" )
-set ( COMPILE_SCRIPT "${COMPILE_SCRIPT}\n  execute_process ( COMMAND ${PYTHON_EXECUTABLE} -m compileall -q -x \"${EXCLUDE_REGEX}\" \"${PACKAGE_ROOT}\")" )
+set ( COMPILE_SCRIPT "${COMPILE_SCRIPT}\n  execute_process ( COMMAND ${PYTHON_EXECUTABLE} -m compileall -q -x \"${EXCLUDE_REGEX}\" \"${PACKAGE_ROOT}\" OUTPUT_QUIET ERROR_QUIET )" )
 
 install ( CODE ${COMPILE_SCRIPT} )