diff --git a/CMakeModules/GenerateSCMRev.cmake b/CMakeModules/GenerateSCMRev.cmake
index c7da2b91d6..a46251dd7e 100644
--- a/CMakeModules/GenerateSCMRev.cmake
+++ b/CMakeModules/GenerateSCMRev.cmake
@@ -38,6 +38,21 @@ if (BUILD_REPOSITORY)
       string(TOUPPER ${FIRST_LETTER} FIRST_LETTER)
       set(REPO_NAME "${REPO_NAME}${FIRST_LETTER}${REMAINDER}")
     endforeach()
+
+    # git describe output looks odd for mainline builds, override this
+    string(SUBSTRING "${GIT_REV}" 0 9 GIT_REV_SHORT)
+    if (GIT_BRANCH STREQUAL "HEAD" AND BUILD_ID AND REPO_NAME STREQUAL "Mainline")
+      set(GIT_BRANCH "mainline")
+      set(GIT_DESC "${BUILD_ID}-${GIT_REV_SHORT}")
+      message(STATUS "mainline, overrode GIT_BRANCH: ${GIT_BRANCH} GIT_DESC: ${GIT_DESC}")
+    elseif (BUILD_ID AND REPO_NAME STREQUAL "Mainline")
+      set(GIT_DESC "mainline-${BUILD_ID}-${GIT_REV_SHORT}")
+      message(STATUS "mainline, overrode GIT_DESC: ${GIT_DESC}")
+    elseif (BUILD_ID AND REPO_NAME STREQUAL "Early Access")
+      set(GIT_DESC "ea-${BUILD_ID}-${GIT_REV_SHORT}")
+      message(STATUS "ea, overrode GIT_DESC: ${GIT_DESC}")
+    endif()
+
     if (BUILD_TAG)
       string(REGEX MATCH "${CMAKE_MATCH_1}-([0-9]+)" OUTVAR ${BUILD_TAG})
       if (${CMAKE_MATCH_COUNT} GREATER 0)