diff --git a/extension/data_loader/mmap_data_loader.cpp b/extension/data_loader/mmap_data_loader.cpp
index ebe74f95266..e990117d586 100644
--- a/extension/data_loader/mmap_data_loader.cpp
+++ b/extension/data_loader/mmap_data_loader.cpp
@@ -140,7 +140,7 @@ void MunmapSegment(void* context, void* data, size_t size) {
     // do about it.
     ET_LOG(
         Error,
-        "munmap(0x%zx, %zu) failed: %s (ignored)",
+        "munmap(0x%zx, %zu) failed: %s (%d) (ignored)",
         (size_t)range.start,
         range.size,
         ::strerror(errno),