diff --git a/build/Program.fs b/build/Program.fs
index 73aa95e26..d17c2620c 100644
--- a/build/Program.fs
+++ b/build/Program.fs
@@ -274,7 +274,7 @@ let push id =
                 PushParams = {
                     p.PushParams
                         with
-                            ApiKey = Some (Environment.environVar apiKeyVariableName)
+                            ApiKey = Some (Environment.GetEnvironmentVariable apiKeyVariableName)
                             Source = source
                             SkipDuplicate = true
                 }