diff --git a/Marlin/src/core/mstring.h b/Marlin/src/core/mstring.h
index 31e8c8c6e6ec..b405262d300d 100644
--- a/Marlin/src/core/mstring.h
+++ b/Marlin/src/core/mstring.h
@@ -143,13 +143,13 @@ class MString {
 
   // Set with format string and arguments, like printf
   template<typename... Args>
-  MString& setf_P(PGM_P const fmt, Args... more) { SNPRINTF_P(str, SIZE, fmt, more...); debug(F("setf_P")); return *this; }
+  MString& setf_P(PGM_P const pfmt, Args... more) { SNPRINTF_P(str, SIZE, pfmt, more...); debug(F("setf_P")); return *this; }
 
   template<typename... Args>
-  MString& setf(const char *fmt, Args... more)   { SNPRINTF(str, SIZE, fmt, more...);   debug(F("setf"));   return *this; }
+  MString& setf(const char *fmt, Args... more) { SNPRINTF(str, SIZE, fmt, more...); debug(F("setf")); return *this; }
 
   template<typename... Args>
-  MString& setf(FSTR_P const fmt, Args... more)  { return setf_P(FTOP(fmt), more...); }
+  MString& setf(FSTR_P const ffmt, Args... more) { return setf_P(FTOP(ffmt), more...); }
 
   // Chainable String appenders
   MString& append()                           { debug(F("nil")); return *this; } // for macros that might emit no output
@@ -206,9 +206,9 @@ class MString {
   MString& append(const spaces_t &s) { return append(repchr_t(' ', s.count)); }
 
   template<typename... Args>
-  MString& appendf_P(PGM_P const fmt, Args... more) {
+  MString& appendf_P(PGM_P const pfmt, Args... more) {
     int sz = length();
-    if (sz < SIZE) SNPRINTF_P(str + sz, SIZE - sz, fmt, more...);
+    if (sz < SIZE) SNPRINTF_P(str + sz, SIZE - sz, pfmt, more...);
     debug(F("appendf_P"));
     return *this;
   }
diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
index f9b73e6d2667..db8d06a297c1 100644
--- a/Marlin/src/core/serial.h
+++ b/Marlin/src/core/serial.h
@@ -271,13 +271,13 @@ class SString : public MString<SIZE> {
   SString& set() { super::set(); return *this; }
 
   template<typename... Args>
-  SString& setf_P(PGM_P const fmt, Args... more) { super::setf_P(fmt, more...); return *this; }
+  SString& setf_P(PGM_P const pfmt, Args... more) { super::setf_P(pfmt, more...); return *this; }
 
   template<typename... Args>
-  SString& setf(const char *fmt, Args... more)   { super::setf(fmt, more...); return *this; }
+  SString& setf(const char *fmt, Args... more)    { super::setf(fmt, more...); return *this; }
 
   template<typename... Args>
-  SString& setf(FSTR_P const fmt, Args... more)  { super::setf(fmt, more...); return *this; }
+  SString& setf(FSTR_P const ffmt, Args... more)  { super::setf(ffmt, more...); return *this; }
 
   template <typename T>
   SString& set(const T &v) { super::set(v); return *this; }
diff --git a/Marlin/src/lcd/marlinui.cpp b/Marlin/src/lcd/marlinui.cpp
index dca18f2125ff..ef78dc2f1dc3 100644
--- a/Marlin/src/lcd/marlinui.cpp
+++ b/Marlin/src/lcd/marlinui.cpp
@@ -1563,12 +1563,12 @@ void MarlinUI::host_notify(const char * const cstr) {
    *
    * @param pfmt    A constant format P-string
    */
-  void MarlinUI::status_printf_P(int8_t level, PGM_P const fmt, ...) {
+  void MarlinUI::status_printf_P(int8_t level, PGM_P const pfmt, ...) {
     if (set_alert_level(level)) return;
 
     va_list args;
-    va_start(args, fmt);
-    vsnprintf_P(status_message, MAX_MESSAGE_LENGTH, fmt, args);
+    va_start(args, pfmt);
+    vsnprintf_P(status_message, MAX_MESSAGE_LENGTH, pfmt, args);
     va_end(args);
 
     host_notify(status_message);
@@ -1642,12 +1642,12 @@ void MarlinUI::host_notify(const char * const cstr) {
   void MarlinUI::_set_status_and_level(const char * const ustr, const int8_t=0, const bool pgm) {
     pgm ? host_notify_P(ustr) : host_notify(ustr);
   }
-  void MarlinUI::status_printf_P(int8_t level, PGM_P const fmt, ...) {
+  void MarlinUI::status_printf_P(int8_t level, PGM_P const pfmt, ...) {
     MString<30> msg;
 
     va_list args;
-    va_start(args, fmt);
-    vsnprintf_P(&msg, 30, fmt, args);
+    va_start(args, pfmt);
+    vsnprintf_P(&msg, 30, pfmt, args);
     va_end(args);
 
     host_notify(msg);