diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index cb2fe0a..8f7470e 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -211,7 +211,7 @@
     for (std::string cgroup_root_path : cgroups) {
         std::unique_ptr<DIR, decltype(&closedir)> root(opendir(cgroup_root_path.c_str()), closedir);
         if (root == NULL) {
-            PLOG(ERROR) << "Failed to open " << cgroup_root_path;
+            PLOG(ERROR) << __func__ << " failed to open " << cgroup_root_path;
         } else {
             dirent* dir;
             while ((dir = readdir(root.get())) != nullptr) {
@@ -297,7 +297,8 @@
             // This happens when process is already dead
             return 0;
         }
-        PLOG(WARNING) << "Failed to open process cgroup uid " << uid << " pid " << initialPid;
+        PLOG(WARNING) << __func__ << " failed to open process cgroup uid " << uid << " pid "
+                      << initialPid;
         return -1;
     }