diff --git a/covconfig.sh b/covconfig.sh
index 33f6faa8d..988a0c276 100755
--- a/covconfig.sh
+++ b/covconfig.sh
@@ -3,8 +3,7 @@
 ## 20160116, iceman
 
 ## Configure ARM ,  make sure you have the arm gcc in your $PATH variable.
-cov-configure -co arm-none-eabi-gcc
-
+cov-configure -co arm-none-eabi-gcc -- -mthumb-interwork