diff --git a/data/json/flags.json b/data/json/flags.json
index c8d081ef9b792..a110f4f20f7d4 100644
--- a/data/json/flags.json
+++ b/data/json/flags.json
@@ -1730,6 +1730,10 @@
     "id": "TOUGH_FEET",
     "type": "json_flag"
   },
+  {
+    "id": "PAIN_IMMUNE",
+    "type": "json_flag"
+  },
   {
     "id": "TOURNIQUET",
     "type": "json_flag"
diff --git a/src/character.cpp b/src/character.cpp
index aeb1f2421bd4d..735a4d9826e2c 100644
--- a/src/character.cpp
+++ b/src/character.cpp
@@ -313,6 +313,7 @@ static const json_character_flag json_flag_NON_THRESH( "NON_THRESH" );
 static const json_character_flag json_flag_NO_DISEASE( "NO_DISEASE" );
 static const json_character_flag json_flag_NO_RADIATION( "NO_RADIATION" );
 static const json_character_flag json_flag_NO_THIRST( "NO_THIRST" );
+static const json_character_flag json_flag_PAIN_IMMUNE( "PAIN_IMMUNE" );
 static const json_character_flag json_flag_PRED2( "PRED2" );
 static const json_character_flag json_flag_PRED3( "PRED3" );
 static const json_character_flag json_flag_PRED4( "PRED4" );
diff --git a/src/flag.cpp b/src/flag.cpp
index d54960af76116..412ee9de2a89a 100644
--- a/src/flag.cpp
+++ b/src/flag.cpp
@@ -228,6 +228,7 @@ const flag_id flag_ORGANIC( "ORGANIC" );
 const flag_id flag_OUTER( "OUTER" );
 const flag_id flag_OVERSIZE( "OVERSIZE" );
 const flag_id flag_PADDED( "PADDED" );
+const flag_id flag_PAIN_IMMUNE( "PAIN_IMMUNE" );
 const flag_id flag_PALS_LARGE( "PALS_LARGE" );
 const flag_id flag_PALS_MEDIUM( "PALS_MEDIUM" );
 const flag_id flag_PALS_SMALL( "PALS_SMALL" );
diff --git a/src/flag.h b/src/flag.h
index a3f566f460acb..54b454ea4dde0 100644
--- a/src/flag.h
+++ b/src/flag.h
@@ -234,6 +234,7 @@ extern const flag_id flag_ORGANIC;
 extern const flag_id flag_OUTER;
 extern const flag_id flag_OVERSIZE;
 extern const flag_id flag_PADDED;
+extern const flag_id flag_PAIN_IMMUNE;
 extern const flag_id flag_PALS_SMALL;
 extern const flag_id flag_PALS_MEDIUM;
 extern const flag_id flag_PALS_LARGE;