diff --git a/wireguard/build-wireguard-go.sh b/wireguard/build-wireguard-go.sh
index ab4ab03dd0..bb38634a12 100755
--- a/wireguard/build-wireguard-go.sh
+++ b/wireguard/build-wireguard-go.sh
@@ -2,7 +2,7 @@
 
 # This script is used to build wireguard-go libraries for all the platforms.
 
-stringContain() { 
+function stringContain() { 
     case $2 in 
         "$1" ) return 0;;
 
@@ -17,7 +17,7 @@ stringContain() {
 
 which getopt
 echo "$(uname -s)"
-if stringContain "$(uname -s)", "Darwin"; then
+if stringContain "$(uname -s)" "Darwin"; then
     echo "using gnu-getopt - $(which gnu-getopt)"
     export PATH="/usr/local/opt/gnu-getopt/bin:$PATH"
 fi