diff --git a/src/hmi_msg.c b/src/hmi_msg.c
new file mode 100644
index 0000000..49cf0f3
--- /dev/null
+++ b/src/hmi_msg.c
@@ -0,0 +1,11 @@
+#include <avr/pgmspace.h>
+#include "hmi_msg.h"
+
+static const char m1[] PROGMEM = "January";
+static const char m2[] PROGMEM = "February";
+static const char m3[] PROGMEM = "March";
+static const char m4[] PROGMEM = "April";
+static const char m5[] PROGMEM = "May";
+static const char m6[] PROGMEM = "June";
+
+extern PGM_P const months[] PROGMEM = {m1,m2,m3,m4,m5,m6};
diff --git a/src/hmi_msg.h b/src/hmi_msg.h
index f3818fd..2913a42 100644
--- a/src/hmi_msg.h
+++ b/src/hmi_msg.h
@@ -1,4 +1,3 @@
-#include <avr/pgmspace.h>
 #ifndef _HMI_MSG_H_
 #define _HMI_MSG_H_
 
@@ -8,12 +7,4 @@
 #define GET_MONTH_MSG "Enter Month name first letter >"
 #define UPTIME_MSG "Uptime: %lu s"
 
-const char m1[] PROGMEM = "January";
-const char m2[] PROGMEM = "February";
-const char m3[] PROGMEM = "March";
-const char m4[] PROGMEM = "April";
-const char m5[] PROGMEM = "May";
-const char m6[] PROGMEM = "June";
-
-PGM_P const months[] PROGMEM = {m1,m2,m3,m4,m5,m6};
 #endif /* _HMI_MSG_H_ */