diff --git a/lib/linguist/heuristics.rb b/lib/linguist/heuristics.rb
index e342e616..2002d51b 100644
--- a/lib/linguist/heuristics.rb
+++ b/lib/linguist/heuristics.rb
@@ -155,12 +155,12 @@ module Linguist
     end
 
     disambiguate "AsciiDoc", "AGS Script", "Public Key" do |data|
-      if /^[=-]+(\s|\n)|{{[A-Za-z]/.match(data)
+      if /^(----[- ]BEGIN|ssh-(rsa|dss)) /.match(data)
+        Language["Public Key"]
+      elsif /^[=-]+(\s|\n)|{{[A-Za-z]/.match(data)
         Language["AsciiDoc"]
       elsif /^(\/\/.+|((import|export)\s+)?(function|int|float|char)\s+((room|repeatedly|on|game)_)?([A-Za-z]+[A-Za-z_0-9]+)\s*[;\(])/.match(data)
         Language["AGS Script"]
-      elsif /^-----BEGIN/.match(data)
-        Language["Public Key"]
       end
     end
 
diff --git a/test/test_heuristics.rb b/test/test_heuristics.rb
index b3197c69..4a156445 100644
--- a/test/test_heuristics.rb
+++ b/test/test_heuristics.rb
@@ -77,7 +77,7 @@ class TestHeuristcs < Minitest::Test
     assert_heuristics({
       "AsciiDoc" => "AsciiDoc/list.asc",
       "AGS Script" => "AGS Script/GlobalScript.asc",
-      "Public Key" => "Public Key/sunCert.asc"
+      "Public Key" => all_fixtures("Public Key", "*.asc")
     })
   end