diff --git a/src/zlib_exception.cpp b/src/zlib_exception.cpp
new file mode 100644
index 0000000..e88c7b3
--- /dev/null
+++ b/src/zlib_exception.cpp
@@ -0,0 +1,77 @@
+/**
+ * @brief zLib exception.
+ *
+ * This file is part of HostLogger project.
+ *
+ * Copyright (c) 2020 YADRO
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "zlib_exception.hpp"
+
+#include <cstring>
+
+ZlibException::ZlibException(Operation op, int code, gzFile fd,
+                             const std::string& fileName)
+{
+    std::string details;
+    if (code == Z_ERRNO)
+    {
+        // System error
+        const int errCode = errno ? errno : EIO;
+        details = strerror(errCode);
+    }
+    else if (fd != Z_NULL)
+    {
+        // Try to get description from zLib
+        int lastErrCode = 0;
+        const char* lastErrDesc = gzerror(fd, &lastErrCode);
+        if (lastErrCode)
+        {
+            details = '[';
+            details += std::to_string(lastErrCode);
+            details += "] ";
+            details += lastErrDesc;
+        }
+    }
+    if (details.empty())
+    {
+        details = "Internal zlib error (code ";
+        details += std::to_string(code);
+        details += ')';
+    }
+
+    what_ = "Unable to ";
+    switch (op)
+    {
+        case Create:
+            what_ += "create";
+            break;
+        case Close:
+            what_ += "close";
+            break;
+        case Write:
+            what_ += "write";
+            break;
+    }
+    what_ += " file ";
+    what_ += fileName;
+    what_ += ": ";
+    what_ += details;
+}
+
+const char* ZlibException::what() const noexcept
+{
+    return what_.c_str();
+}