diff --git a/src/LedControl.h b/src/LedControl.h
index cdfaa1f5..d62263c1 100644
--- a/src/LedControl.h
+++ b/src/LedControl.h
@@ -27,7 +27,13 @@
 #ifndef LedControl_h
 #define LedControl_h
 
+//--------------------
+#if (defined(__AVR__))
 #include <avr/pgmspace.h>
+#else			// make the library compatible with ESP8266 modules
+#include <pgmspace.h>	// thanks to Ikarisan
+#endif			// https://github.com/SodaqMoja/Sodaq_DS3231/issues/5
+//--------------------
 
 #if (ARDUINO >= 100)
 #include <Arduino.h>
@@ -41,21 +47,21 @@
  */
 const static byte charTable [] PROGMEM  = {
     B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000,
-    B01111111,B01111011,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,
-    B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
+    B01111111,B01111011,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,    
     B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
     B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
+    B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,    
     B00000000,B00000000,B00000000,B00000000,B10000000,B00000001,B10000000,B00000000,
     B01111110,B00110000,B01101101,B01111001,B00110011,B01011011,B01011111,B01110000,
     B01111111,B01111011,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
-    B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B00000000,
-    B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00000000,B00000000,
-    B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
-    B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00001000,
-    B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B00000000,
-    B00110111,B00000000,B00000000,B00000000,B00001110,B00000000,B00010101,B00011101,
-    B01100111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
-    B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000
+    B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B01011110,
+    B00110111,B00010000,B00111100,B00000000,B00001110,B00000000,B00010101,B00011101,
+    B01100111,B00000000,B00000101,B00000000,B00000111,B00011100,B00000000,B00000000,
+    B00000000,B00111011,B00000000,B00000000,B00000000,B00000000,B00000000,B00001000,
+    B00000000,B01110111,B00011111,B00001101,B00111101,B01001111,B01000111,B01011110,
+    B00110111,B00010000,B00111100,B00000000,B00001110,B00000000,B00010101,B00011101,
+    B01100111,B00000000,B00000101,B00000000,B00000111,B00011100,B00000000,B00000000,
+    B00000000,B00111011,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000
 };
 
 class LedControl {