diff --git a/cores/piduino/pgmspace.h b/cores/piduino/pgmspace.h
index 1385fd3c..b027550f 100644
--- a/cores/piduino/pgmspace.h
+++ b/cores/piduino/pgmspace.h
@@ -21,4 +21,10 @@ typedef char __FlashStringHelper;
 #define pgm_read_float_far(addr) pgm_read_float(addr)
 
 #define memcpy_P(to,from,len) memcpy(to,from,len)
+
+// https://github.com/esp8266/Arduino/blob/85ba53a24994db5ec2aff3b7adfa05330a637413/tests/host/sys/pgmspace.h
+#define strcmp_P strcmp
+#define strncmp_P strncmp
+#define sprintf_P sprintf
+#define printf_P printf
 #endif