diff --git a/src/strings.cpp b/src/strings.cpp
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -874,7 +874,7 @@ static char *FormatString(char *buff, co
 						bool lookup = (l == SCC_ENCODED);
 						if (lookup) s += len;
 
-						param = (int32)strtoul(s, &p, 16);
+						param = strtoull(s, &p, 16);
 
 						if (lookup) {
 							if (param >= TAB_SIZE) {