diff -u nethack-3.4.1/src/eat.c nethack-3.4.1-fxc/src/eat.c
--- nethack-3.4.1/src/eat.c     Sun Feb 23 14:43:26 2003
+++ nethack-3.4.1-fxc/src/eat.c Mon May 26 00:04:04 2003
@@ -670,6 +670,7 @@
                        You(Hallucination ? "be chillin'." :
                            "feel a momentary chill.");
                        HFire_resistance |= FROMOUTSIDE;
+                       HCold_resistance &= ~FROMOUTSIDE;
                }
                break;
            case SLEEP_RES:
@@ -688,6 +689,7 @@
                if(!(HCold_resistance & FROMOUTSIDE)) {
                        You_feel("full of hot air.");
                        HCold_resistance |= FROMOUTSIDE;
+                       HFire_resistance &= ~FROMOUTSIDE;
                }
                break;
            case DISINT_RES:
diff -u nethack-3.4.1/src/pray.c nethack-3.4.1-fxc/src/pray.c
--- nethack-3.4.1/src/pray.c    Sun Feb 23 14:43:29 2003
+++ nethack-3.4.1-fxc/src/pray.c        Mon May 26 00:04:04 2003
@@ -616,9 +616,20 @@
     int sp_no;
 #define ok_wep(o) ((o) && ((o)->oclass == WEAPON_CLASS || is_weptool(o)))
 
+    if (HFire_resistance & FROMOUTSIDE) {
+        HCold_resistance |= FROMOUTSIDE;
+        HFire_resistance &= ~FROMOUTSIDE;
+    }
+    else if (HCold_resistance & FROMOUTSIDE) {
+             HFire_resistance |= FROMOUTSIDE;
+             HCold_resistance &= ~FROMOUTSIDE;
+    }
+    else {
+         HFire_resistance |= FROMOUTSIDE;
+         HCold_resistance |= FROMOUTSIDE;
+    }
+
     HSee_invisible |= FROMOUTSIDE;
-    HFire_resistance |= FROMOUTSIDE;
-    HCold_resistance |= FROMOUTSIDE;
     HShock_resistance |= FROMOUTSIDE;
     HSleep_resistance |= FROMOUTSIDE;
     HPoison_resistance |= FROMOUTSIDE;