diff --git a/polymer/eduke32/build/include/cache1d.h b/polymer/eduke32/build/include/cache1d.h
index 8cd89910b..b23e822cd 100644
--- a/polymer/eduke32/build/include/cache1d.h
+++ b/polymer/eduke32/build/include/cache1d.h
@@ -45,6 +45,7 @@ int32_t	ktell(int32_t handle);
 void	kclose(int32_t handle);
 
 void krename(int32_t crcval, int32_t filenum, const char *newname);
+char const * kfileparent(int32_t handle);
 
 typedef struct { intptr_t *hand; int32_t leng; char *lock ; } cactype;
 
diff --git a/polymer/eduke32/build/src/cache1d.c b/polymer/eduke32/build/src/cache1d.c
index f05690b21..fbddd27b0 100644
--- a/polymer/eduke32/build/src/cache1d.c
+++ b/polymer/eduke32/build/src/cache1d.c
@@ -1100,6 +1100,16 @@ void krename(int32_t crcval, int32_t filenum, const char *newname)
     }
 }
 
+char const * kfileparent(int32_t const handle)
+{
+    int32_t const groupnum = filegrp[handle];
+
+    if ((unsigned)groupnum >= MAXGROUPFILES || groupfil[groupnum] == -1)
+        return NULL;
+
+    return groupname[groupnum];
+}
+
 int32_t kopen4load(const char *filename, char searchfirst)
 {
     int32_t newhandle = MAXOPENFILES-1;