diff --git a/config/global/ct-behave.in b/config/global/ct-behave.in
index 53f4adf9..f3be63e3 100644
--- a/config/global/ct-behave.in
+++ b/config/global/ct-behave.in
@@ -44,6 +44,7 @@ config DEBUG_CT
     bool
     prompt "Debug crosstool-NG"
     default n
+    depends on ! BACKEND
     help
       Say 'y' here to get some options regarding debugging crosstool-NG.