diff --git a/src/util/util.cr b/src/util/util.cr
index 9019720..3fc1b2d 100644
--- a/src/util/util.cr
+++ b/src/util/util.cr
@@ -61,3 +61,9 @@ class String
     self.chars.all? { |c| c.alphanumeric? || c == '_' }
   end
 end
+
+def env_is_true?(key : String) : Bool
+  val = ENV[key.upcase]? || ENV[key.downcase]?
+  return false unless val
+  val.downcase.in? "1", "true"
+end
diff --git a/src/util/web.cr b/src/util/web.cr
index 186beb7..c384099 100644
--- a/src/util/web.cr
+++ b/src/util/web.cr
@@ -86,9 +86,7 @@ module HTTP
   class Client
     private def self.exec(uri : URI, tls : TLSContext = nil)
       previous_def uri, tls do |client, path|
-        disable_ssl_verification = ENV["DISABLE_SSL_VERIFICATION"]? ||
-                                   ENV["disable_ssl_verification"]?
-        if disable_ssl_verification && client.tls?
+        if client.tls? && env_is_true? "DISABLE_SSL_VERIFICATION"
           Logger.debug "Disabling SSL verification"
           client.tls.verify_mode = OpenSSL::SSL::VerifyMode::NONE
         end