diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index 2f9e7a7..da1e9d8 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -353,10 +353,18 @@
 char tounderline(char c) {
   return ::isblank(c) ? '_' : c;
 }
+
 char toprintable(char c) {
   return ::isprint(c) ? c : '?';
 }
 
+// Cleanup boot_reason regarding acceptable character set
+void transformReason(std::string& reason) {
+  std::transform(reason.begin(), reason.end(), reason.begin(), ::tolower);
+  std::transform(reason.begin(), reason.end(), reason.begin(), tounderline);
+  std::transform(reason.begin(), reason.end(), reason.begin(), toprintable);
+}
+
 const char system_reboot_reason_property[] = "sys.boot.reason";
 const char last_reboot_reason_property[] = LAST_REBOOT_REASON_PROPERTY;
 const char bootloader_reboot_reason_property[] = "ro.boot.bootreason";
@@ -370,10 +378,7 @@
   // If sys.boot.reason == ro.boot.bootreason, let's re-evaluate
   if (reason == ret) ret = "";
 
-  // Cleanup boot_reason regarding acceptable character set
-  std::transform(reason.begin(), reason.end(), reason.begin(), ::tolower);
-  std::transform(reason.begin(), reason.end(), reason.begin(), tounderline);
-  std::transform(reason.begin(), reason.end(), reason.begin(), toprintable);
+  transformReason(reason);
 
   // Is the current system boot reason sys.boot.reason valid?
   if (!isKnownRebootReason(ret)) ret = "";
@@ -462,13 +467,13 @@
         pos += strlen(cmd);
         std::string subReason(content.substr(pos, max_reason_length));
         for (pos = 0; pos < subReason.length(); ++pos) {
-          char c = tounderline(subReason[pos]);
+          char c = subReason[pos];
           if (!::isprint(c) || (c == '\'')) {
             subReason.erase(pos);
             break;
           }
-          subReason[pos] = ::tolower(c);
         }
+        transformReason(subReason);
         if (subReason != "") {  // Will not land "reboot" as that is too blunt.
           if (isKernelRebootReason(subReason)) {
             ret = "reboot," + subReason;  // User space can't talk kernel reasons.
@@ -565,10 +570,7 @@
       // Content buffer no longer will have console data. Beware if more
       // checks added below, that depend on parsing console content.
       content = GetProperty(last_reboot_reason_property);
-      // Cleanup last_boot_reason regarding acceptable character set
-      std::transform(content.begin(), content.end(), content.begin(), ::tolower);
-      std::transform(content.begin(), content.end(), content.begin(), tounderline);
-      std::transform(content.begin(), content.end(), content.begin(), toprintable);
+      transformReason(content);
 
       // Anything in last is better than 'super-blunt' reboot or shutdown.
       if ((ret == "") || (ret == "reboot") || (ret == "shutdown") || !isBluntRebootReason(content)) {