diff --git a/mendel/temp.c b/mendel/temp.c
index 913b91c..c1310b9 100644
--- a/mendel/temp.c
+++ b/mendel/temp.c
@@ -159,7 +159,11 @@ void temp_print() {
 
 		c = (current_temp & 3) * 25;
 		t = (target_temp & 3) * 25;
+		#ifdef REPRAP_HOST_COMPATIBILITY
+		sersendf_P(PSTR("T: %u.%u\n"), current_temp >> 2, c);
+		#else
 		sersendf_P(PSTR("T: %u.%u/%u.%u :%u\n"), current_temp >> 2, c, target_temp >> 2, t, temp_residency);
+		#endif
 	}
 }
 
diff --git a/mendel/temp.h b/mendel/temp.h
index 71902fd..44c3acd 100644
--- a/mendel/temp.h
+++ b/mendel/temp.h
@@ -3,6 +3,9 @@
 
 #include	<stdint.h>
 
+// RepRap host software isn't exactly tolerant on what it ready back.
+#define REPRAP_HOST_COMPATIBILITY
+
 // extruder heater PID factors
 // google "PID without a PHD" if you don't understand this PID stuff
 extern int32_t p_factor;