diff --git a/lib/FileIOFILE.cpp b/lib/FileIOFILE.cpp
index e3a4531..f3a411c 100644
--- a/lib/FileIOFILE.cpp
+++ b/lib/FileIOFILE.cpp
@@ -69,8 +69,11 @@ public:
         }
         uint64_t write(const void* buf, uint64_t length)
         {
-            if (FTell(fp) + length > m_maxWriteSize)
-                LogModule.report(LogVisor::FatalError, _S("write operation exceeds file's %" PRIi64 "-byte limit"), m_maxWriteSize);
+            if (m_maxWriteSize >= 0)
+            {
+                if (FTell(fp) + length > m_maxWriteSize)
+                    LogModule.report(LogVisor::FatalError, _S("write operation exceeds file's %" PRIi64 "-byte limit"), m_maxWriteSize);
+            }
             return fwrite(buf, 1, length, fp);
         }
         uint64_t copyFromDisc(IPartReadStream& discio, uint64_t length)
diff --git a/lib/FileIOWin32.cpp b/lib/FileIOWin32.cpp
index b186132..662c82a 100644
--- a/lib/FileIOWin32.cpp
+++ b/lib/FileIOWin32.cpp
@@ -72,11 +72,14 @@ public:
         }
         uint64_t write(const void* buf, uint64_t length)
         {
-            LARGE_INTEGER li = {};
-            LARGE_INTEGER res;
-            SetFilePointerEx(fp, li, &res, FILE_CURRENT);
-            if (res.QuadPart + int64_t(length) > m_maxWriteSize)
-                LogModule.report(LogVisor::FatalError, _S("write operation exceeds file's %" PRIi64 "-byte limit"), m_maxWriteSize);
+            if (m_maxWriteSize >= 0)
+            {
+                LARGE_INTEGER li = {};
+                LARGE_INTEGER res;
+                SetFilePointerEx(fp, li, &res, FILE_CURRENT);
+                if (res.QuadPart + int64_t(length) > m_maxWriteSize)
+                    LogModule.report(LogVisor::FatalError, _S("write operation exceeds file's %" PRIi64 "-byte limit"), m_maxWriteSize);
+            }
 
             DWORD ret = 0;
             WriteFile(fp, buf, length, &ret, nullptr);