diff --git a/reactos/tools/rsym.c b/reactos/tools/rsym.c
index 968c03a4c1c..21885b4e985 100644
--- a/reactos/tools/rsym.c
+++ b/reactos/tools/rsym.c
@@ -442,7 +442,8 @@ ConvertStabs(ULONG *SymbolsCount, PROSSYM_ENTRY *SymbolsBase,
         {
           case N_SO:
             Name = (char *) StabStringsBase + StabEntry[i].n_strx;
-            if ('\0' == *Name || '/' == Name[strlen(Name) - 1]
+            if (StabStringsLength < StabEntry[i].n_strx
+                ||'\0' == *Name || '/' == Name[strlen(Name) - 1]
                 || '\\' == Name[strlen(Name) - 1]
                 || StabEntry[i].n_value < ImageBase)
               {