diff --git a/third_party/build_unbound.sh b/third_party/build_unbound.sh
index 264ecb2..1a66187 100755
--- a/third_party/build_unbound.sh
+++ b/third_party/build_unbound.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-if [[ ${build_os_type} == "win32 ]]; then
+if [[ ${build_os_type} == "win32" ]]; then
     echo "Windows does not require libunbound"
     echo "Dont building library"
     exit 0