diff --git a/format.ipp b/format.ipp
index 6efc8da1..42ac2461 100644
--- a/format.ipp
+++ b/format.ipp
@@ -729,8 +729,8 @@ namespace util { namespace format { namespace detail {
         if (spec.k != (std::is_unsigned<ValueT>::value ? specifier::kind::UNSIGNED : specifier::kind::SIGNED))
             throw conversion_error ("invalid conversion specifier for integer value");
 
-        if (spec.length != sizeof (ValueT))
-            throw length_error ("incorrect value size");
+        if (sizeof (ValueT) > spec.length)
+            throw length_error ("overlength value parameter");
 
         const auto numerals   = digits (t, spec.base);
         const auto characters = numerals + (spec.positive_char ? 1 : 0);
diff --git a/test/format.cpp b/test/format.cpp
index 119d84c0..0628ea58 100644
--- a/test/format.cpp
+++ b/test/format.cpp
@@ -167,7 +167,7 @@ main (void)
     CHECK_THROW("%i", conversion_error, nullptr);
 
     CHECK_THROW("%hhi", length_error, (long long)1);
-    CHECK_THROW("%lli", length_error, (signed char)1);
+    //CHECK_THROW("%lli", length_error, (signed char)1);
 
     CHECK_THROW("%u", conversion_error, 1.);
     CHECK_THROW("%u", conversion_error, "foo");
@@ -176,7 +176,7 @@ main (void)
     CHECK_THROW("%u", conversion_error, nullptr);
 
     CHECK_THROW("%hhu", length_error, (unsigned long long)1);
-    CHECK_THROW("%llu", length_error, (unsigned char)1);
+    //CHECK_THROW("%llu", length_error, (unsigned char)1);
 
     CHECK_THROW("%f", conversion_error, 1u);
     CHECK_THROW("%f", conversion_error, "foo");