diff --git a/1k/build.ps1 b/1k/build.ps1
index 450dbc4..6c2e566 100644
--- a/1k/build.ps1
+++ b/1k/build.ps1
@@ -305,7 +305,7 @@ else {
 
 $Global:target_minsdk = $options.minsdk
 if(!$Global:target_minsdk) {
-    $Global:target_minsdk = @{osx = '10.12'; winrt = '10.0.17763.0'}[$TARGET_OS]
+    $Global:target_minsdk = @{osx = '10.13'; winrt = '10.0.17763.0'}[$TARGET_OS]
 }
 
 # define some useful global vars
diff --git a/src/openssl/build1.ps1 b/src/openssl/build1.ps1
index eb54627..5d46ae0 100644
--- a/src/openssl/build1.ps1
+++ b/src/openssl/build1.ps1
@@ -51,6 +51,9 @@ else {
 
     if ($Global:is_mac) {
         $TARGET_OPTIONS += "darwin64-$ossl_target_cpu-cc"
+        if ($Global:target_minsdk) {
+            $TARGET_OPTIONS += "-mmacosx-version-min=$Global:target_minsdk"
+        }
     }
     elseif ($Global:is_ios -or $Global:is_tvos) {
         $ossl_target_os = "$target_os-"