diff --git a/algparam.h b/algparam.h
index 15515313..61783371 100644
--- a/algparam.h
+++ b/algparam.h
@@ -320,8 +320,8 @@ public:
 			if (m_throwIfNotUsed && !m_used)
 				throw ParameterNotUsed(m_name);
 		}
-#if !defined(CRYPTOPP_CXX17_EXCEPTIONS)
-# if !defined(CRYPTOPP_UNCAUGHT_EXCEPTION_AVAILABLE)
+#if !defined(CRYPTOPP_UNCAUGHT_EXCEPTION_AVAILABLE)
+# if !defined(CRYPTOPP_CXX17_EXCEPTIONS)
 		catch(const Exception&)
 		{
 		}