diff --git a/source/duke3d/src/gamedef.cpp b/source/duke3d/src/gamedef.cpp
index 51f3215f6..93a0ecaf9 100644
--- a/source/duke3d/src/gamedef.cpp
+++ b/source/duke3d/src/gamedef.cpp
@@ -574,6 +574,7 @@ const char *keyw[] =
     "divscale",                 // 400
     "scalevar",                 // 401
     "undefinegamefunc",         // 402
+    "getclosestcol",            // 403
     "<null>"
 };
 #endif
@@ -4078,6 +4079,7 @@ DO_DEFSTATE:
             continue;
 
         case CON_CLAMP:
+        case CON_GETCLOSESTCOL:
             C_GetNextVarType(GAMEVAR_READONLY);
             C_GetManyVars(2);
             continue;
diff --git a/source/duke3d/src/gamedef.h b/source/duke3d/src/gamedef.h
index 565c8761f..ebc46cf0f 100644
--- a/source/duke3d/src/gamedef.h
+++ b/source/duke3d/src/gamedef.h
@@ -1136,6 +1136,7 @@ enum ScriptKeywords_t
     CON_DIVSCALE,           // 400
     CON_SCALEVAR,           // 401
     CON_UNDEFINEGAMEFUNC,   // 402
+    CON_GETCLOSESTCOL,      // 403
     CON_END
 };
 // KEEPINSYNC with the keyword list in lunatic/con_lang.lua
diff --git a/source/duke3d/src/gameexec.cpp b/source/duke3d/src/gameexec.cpp
index 8b8beb4b0..4287a96d9 100644
--- a/source/duke3d/src/gameexec.cpp
+++ b/source/duke3d/src/gameexec.cpp
@@ -4890,6 +4890,15 @@ finish_qsprintf:
             }
             continue;
 
+        case CON_GETCLOSESTCOL:
+            insptr++;
+            {
+                tw = *insptr++;
+                int32_t const rgb = Gv_GetVarX(*insptr++);
+                Gv_SetVarX(tw, getclosestcol_lim(rgb & 0xFF, (rgb >> 8) & 0xFF, (rgb >> 16) & 0xFF, Gv_GetVarX(*insptr++)));
+            }
+            continue;
+
         case CON_INV:
             if ((aGameVars[*(insptr + 1)].flags & (GAMEVAR_USER_MASK | GAMEVAR_PTR_MASK)) == 0)
                 aGameVars[*(insptr + 1)].global = -aGameVars[*(insptr + 1)].global;