diff --git a/src/lck-linux.c b/src/lck-linux.c
index d46ebf47..6ab9907b 100644
--- a/src/lck-linux.c
+++ b/src/lck-linux.c
@@ -143,7 +143,7 @@ static int mdbx_lck_op(mdbx_filehandle_t fd, int cmd, short lck, off_t offset,
       return 0;
     }
     int rc = errno;
-    if (rc != EINTR)
+    if (rc != EINTR || cmd == op_setlkw)
       return rc;
   }
 }
diff --git a/src/lck-posix.c b/src/lck-posix.c
index 5bfb55b3..c8f20b57 100644
--- a/src/lck-posix.c
+++ b/src/lck-posix.c
@@ -105,7 +105,7 @@ static int mdbx_lck_op(mdbx_filehandle_t fd, int cmd, short lck, off_t offset,
       return 0;
     }
     int rc = errno;
-    if (rc != EINTR)
+    if (rc != EINTR || cmd == F_SETLKW)
       return rc;
   }
 }