diff --git a/src/w_wad.cpp b/src/w_wad.cpp
index 2c8213828..412450d0a 100644
--- a/src/w_wad.cpp
+++ b/src/w_wad.cpp
@@ -567,6 +567,13 @@ int FWadCollection::CheckNumForFullName (const char *name, bool trynormal, int n
 	return -1;
 }
 
+DEFINE_ACTION_FUNCTION(_Wads, CheckNumForFullName)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(name);
+	ACTION_RETURN_INT(Wads.CheckNumForFullName(name));
+}
+
 int FWadCollection::CheckNumForFullName (const char *name, int wadnum)
 {
 	uint32_t i;
diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index 9c429fb4d..a6866f0ff 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -638,6 +638,7 @@ struct Wads
 	}
 
 	native static int CheckNumForName(string name, int ns, int wadnum = -1, bool exact = false);
+	native static int CheckNumForFullName(string name);
 	native static int FindLump(string name, int startlump = 0, FindLumpNamespace ns = GlobalNamespace);
 	native static string ReadLump(int lump);
 }