diff --git a/src/gl/models/gl_models.cpp b/src/gl/models/gl_models.cpp
index 47283b51a..0bfc059a1 100644
--- a/src/gl/models/gl_models.cpp
+++ b/src/gl/models/gl_models.cpp
@@ -787,6 +787,10 @@ void gl_InitModels()
 							map[c]=1;
 						}
 					}
+					else if (sc.Compare("dontcullbackfaces"))
+					{
+						smf.flags |= MDL_DONTCULLBACKFACES;
+					}
 					else
 					{
 						sc.ScriptMessage("Unrecognized string \"%s\"", sc.String);
@@ -949,8 +953,9 @@ void gl_RenderModel(GLSprite * spr)
 	gl_RenderState.EnableTexture(true);
 	// [BB] In case the model should be rendered translucent, do back face culling.
 	// This solves a few of the problems caused by the lack of depth sorting.
+	// [Nash] Don't do back face culling if explicitly specified in MODELDEF
 	// TO-DO: Implement proper depth sorting.
-	if (!( spr->actor->RenderStyle == LegacyRenderStyles[STYLE_Normal] ))
+	if (!(spr->actor->RenderStyle == LegacyRenderStyles[STYLE_Normal]) && !(smf->flags & MDL_DONTCULLBACKFACES))
 	{
 		glEnable(GL_CULL_FACE);
 		glFrontFace(GL_CW);
diff --git a/src/gl/models/gl_models.h b/src/gl/models/gl_models.h
index f0267b891..c37b69b5e 100644
--- a/src/gl/models/gl_models.h
+++ b/src/gl/models/gl_models.h
@@ -370,6 +370,7 @@ enum
 	MDL_USEACTORPITCH				= 32,
 	MDL_USEACTORROLL				= 64,
 	MDL_BADROTATION					= 128,
+	MDL_DONTCULLBACKFACES			= 256,
 };
 
 struct FSpriteModelFrame