diff --git a/cores/esp8266/core_esp8266_postmortem.c b/cores/esp8266/core_esp8266_postmortem.c
index 3878cf1b9d..e8e04f7756 100644
--- a/cores/esp8266/core_esp8266_postmortem.c
+++ b/cores/esp8266/core_esp8266_postmortem.c
@@ -166,7 +166,7 @@ void __wrap_system_restart_local() {
 
     // Use cap-X formatting to ensure the standard EspExceptionDecoder doesn't match the address
     if (umm_last_fail_alloc_addr) {
-      ets_printf("\nlast failed alloc call: %08X(%d)\n", (uint32_t)umm_last_fail_alloc_addr, umm_last_fail_alloc_size);
+      ets_printf_P("\nlast failed alloc call: %08X(%d)\n", (uint32_t)umm_last_fail_alloc_addr, umm_last_fail_alloc_size);
     }
 
     custom_crash_callback( &rst_info, sp + offset, stack_end );
diff --git a/cores/esp8266/debug.h b/cores/esp8266/debug.h
index 92d1356dce..0a804e76b2 100644
--- a/cores/esp8266/debug.h
+++ b/cores/esp8266/debug.h
@@ -23,7 +23,7 @@ extern "C" {
 #endif
 
 void __panic_func(const char* file, int line, const char* func) __attribute__((noreturn));
-#define panic() __panic_func(__FILE__, __LINE__, __func__)
+#define panic() __panic_func(PSTR(__FILE__), __LINE__, __func__)
 
 #ifdef __cplusplus
 }