diff --git a/tools/configure b/tools/configure
index ef87266773..ddf1b93c7b 100755
--- a/tools/configure
+++ b/tools/configure
@@ -4398,6 +4398,9 @@ fi
       if [ "$modelname" = "sansae200r" ]; then
           echo "Do not use the e200R target for simulator builds.  Use e200 instead."
           exit 8
+      elif [ "$modelname" = "sdlapp" ]; then
+          echo "Do not use sdlapp for simulator builds; it is already a native SDL application."
+          exit 8
       fi
       debug="-DDEBUG"
       simulator="yes"