diff --git a/vpnor/pnor_partition.cpp b/vpnor/pnor_partition.cpp
index 84aeb3f..67a24f4 100644
--- a/vpnor/pnor_partition.cpp
+++ b/vpnor/pnor_partition.cpp
@@ -126,8 +126,8 @@
     int fd = ::open(path.c_str(), flags);
     if (fd == -1)
     {
-        MSG_ERR("Failed to open backing file at '%s': %d\n",
-                path.c_str(), errno);
+        MSG_ERR("Failed to open backing file at '%s': %d\n", path.c_str(),
+                errno);
         throw std::system_error(errno, std::system_category());
     }