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-rw-r--r--lib/system/sysstr.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/system/sysstr.nim b/lib/system/sysstr.nim
index 854c76d53..11780a9aa 100644
--- a/lib/system/sysstr.nim
+++ b/lib/system/sysstr.nim
@@ -67,7 +67,8 @@ proc copyStrLast(s: NimString, start, last: int): NimString {.compilerProc.} =
   if len > 0:
     result = rawNewStringNoInit(len)
     result.len = len
-    c_memcpy(result.data, addr(s.data[start]), len + 1)
+    c_memcpy(result.data, addr(s.data[start]), len)
+    result.data[len] = '\0'
   else:
     result = rawNewString(len)