diff --git a/sdk/tools/rsym/rsym.c b/sdk/tools/rsym/rsym.c
index 192d46cdf63..995cc4a4691 100644
--- a/sdk/tools/rsym/rsym.c
+++ b/sdk/tools/rsym/rsym.c
@@ -377,7 +377,7 @@ ConvertCoffs(ULONG *SymbolsCount, PROSSYM_ENTRY *SymbolsBase,
 {
     ULONG Count, i;
     PCOFF_SYMENT CoffEntry;
-    char FuncName[256], FileName[1024];
+    char FuncName[512], FileName[1024];
     char *p;
     PROSSYM_ENTRY Current;
     struct StringHashTable StringHash;