diff --git a/src/jquery/jquery.js b/src/jquery/jquery.js
index 7c0562aa..9bcec930 100644
--- a/src/jquery/jquery.js
+++ b/src/jquery/jquery.js
@@ -1857,7 +1857,7 @@ jQuery.extend({
 		// If a string is passed in for the function, make a function
 		// for it (a handy shortcut)
 		if ( typeof fn == "string" )
-			fn = eval("function(a,i){return " + fn + "}");
+			fn = eval("false||function(a,i){return " + fn + "}");
 
 		var result = [];
 
@@ -1911,7 +1911,7 @@ jQuery.extend({
 		// If a string is passed in for the function, make a function
 		// for it (a handy shortcut)
 		if ( typeof fn == "string" )
-			fn = eval("function(a){return " + fn + "}");
+			fn = eval("false||function(a){return " + fn + "}");
 
 		var result = [];
 
diff --git a/src/selector/selector.js b/src/selector/selector.js
index cf231111..bd8c7912 100644
--- a/src/selector/selector.js
+++ b/src/selector/selector.js
@@ -405,7 +405,7 @@ jQuery.extend({
 					f = jQuery.expr[m[1]][m[2]];
 
 				// Build a custom macro to enclose it
-				eval("f = function(a,i){return " + f + "}");
+				f = eval("false||function(a,i){return " + f + "}");
 
 				// Execute it against the current filter
 				r = jQuery.grep( r, f, not );