diff --git a/test/unit/support.js b/test/unit/support.js
index fda26870b..2b029ed1e 100644
--- a/test/unit/support.js
+++ b/test/unit/support.js
@@ -158,10 +158,16 @@ if ( jQuery.css ) {
 
 })();
 
-testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Security/CSP) restrictions",
-	"support/csp.php",
-	function( support ) {
-		expect( 1 );
-		deepEqual( jQuery.extend( {}, support ), computedSupport, "No violations of CSP polices" );
-	}
-);
+// Support: Safari 5.1
+// Shameless browser-sniff, but Safari 5.1 mishandles CSP
+if ( !( typeof navigator !== "undefined" &&
+	(/ AppleWebKit\/\d.*? Version\/(\d+)/.exec(navigator.userAgent) || [])[1] < 6 ) ) {
+
+	testIframeWithCallback( "Check CSP (https://developer.mozilla.org/en-US/docs/Security/CSP) restrictions",
+		"support/csp.php",
+		function( support ) {
+			expect( 1 );
+			deepEqual( jQuery.extend( {}, support ), computedSupport, "No violations of CSP polices" );
+		}
+	);
+}