diff --git a/indra/cmake/Variables.cmake b/indra/cmake/Variables.cmake
index b1afa31e2..3b6ec6598 100644
--- a/indra/cmake/Variables.cmake
+++ b/indra/cmake/Variables.cmake
@@ -270,6 +270,8 @@ if (NOT VIEWER_CHANNEL_GRK)
     set(VIEWER_CHANNEL_GRK "\\u03B1") # "α"
   elseif (VIEWER_CHANNEL_TYPE MATCHES "Beta")
     set(VIEWER_CHANNEL_GRK "\\u03B2") # "β"
+  else()
+    set(VIEWER_CHANNEL_GRK "")
   endif ()
 endif (NOT VIEWER_CHANNEL_GRK)