diff --git a/reactos/base/services/eventlog/file.c b/reactos/base/services/eventlog/file.c
index 4c8db6e79f6..bc68d3dcad5 100644
--- a/reactos/base/services/eventlog/file.c
+++ b/reactos/base/services/eventlog/file.c
@@ -704,6 +704,7 @@ BOOL LogfWriteData(PLOGFILE LogFile, DWORD BufSize, PBYTE Buffer)
 
     if (!GetFileSizeEx(LogFile->hFile, &logFileSize))
     {
+        LeaveCriticalSection(&LogFile->cs);
         return FALSE;
     }
 
@@ -751,6 +752,7 @@ BOOL LogfWriteData(PLOGFILE LogFile, DWORD BufSize, PBYTE Buffer)
             if (RecBuf->Reserved != LOGFILE_SIGNATURE)
             {
                 DPRINT1("LogFile corrupt!\n");
+                LeaveCriticalSection(&LogFile->cs);
                 return FALSE;
             }