diff --git a/TestHelper.cpp b/TestHelper.cpp
index 9a1b16935..2ed1ed4d0 100644
--- a/TestHelper.cpp
+++ b/TestHelper.cpp
@@ -479,7 +479,7 @@ bytes importCode(json_spirit::mObject& _o)
 {
 	bytes code;
 	if (_o["code"].type() == json_spirit::str_type)
-		if (_o["code"].get_str().find_first_of("0x") != 0)
+		if (_o["code"].get_str().find("0x") != 0)
 			code = compileLLL(_o["code"].get_str(), false);
 		else
 			code = fromHex(_o["code"].get_str().substr(2));