diff --git a/src/EbmlSInteger.cpp b/src/EbmlSInteger.cpp
index 4adc93b..ff3ec4a 100644
--- a/src/EbmlSInteger.cpp
+++ b/src/EbmlSInteger.cpp
@@ -99,7 +99,7 @@ uint64 EbmlSInteger::UpdateSize(bool bWithDefault, bool /* bForceRender */)
 		SetSize_(2);
 	} else if (Value <= 0x7FFFFF && Value >= (-0x800000)) {
 		SetSize_(3);
-	} else if (Value <= 0x7FFFFFFF && Value >= (-0x80000000)) {
+	} else if (Value <= EBML_PRETTYLONGINT(0x7FFFFFFF) && Value >= (EBML_PRETTYLONGINT(-0x80000000))) {
 		SetSize_(4);
 	} else if (Value <= EBML_PRETTYLONGINT(0x7FFFFFFFFF) &&
 		   Value >= EBML_PRETTYLONGINT(-0x8000000000)) {