diff --git a/checkconnection.sh b/checkconnection.sh
index 5eb4a36..64a0e0a 100755
--- a/checkconnection.sh
+++ b/checkconnection.sh
@@ -65,8 +65,11 @@ testwithping() {
 ## Main
 #
 
-# Check for curl and ping and check network
+# Set $curlbin and $pingbin to "0" when not installed (workaround for sh)
+if [[ $curlbin = "" ]]; then curlbin=0; fi
+if [[ $pingbin = "" ]]; then pingbin=0; fi
 
+# Check network
 if [[ -x ${curlbin} ]]; then
 	testwithcurl