diff --git a/ctpv.c b/ctpv.c
index 7f33a41..49ac864 100644
--- a/ctpv.c
+++ b/ctpv.c
@@ -106,12 +106,13 @@ static int preview(int argc, char *argv[])
         return ERR;
     }
 
-    char *f, *w, *h, *x, *y;
+    char *f, *w, *h, *x, *y, *id;
     GET_PARG(f, 0);
     GET_PARG(w, 1);
     GET_PARG(h, 2);
     GET_PARG(x, 3);
     GET_PARG(y, 4);
+    GET_PARG(id, 5);
 
     ERRCHK_RET_OK(check_file(f));
 
@@ -124,7 +125,7 @@ static int preview(int argc, char *argv[])
 
     PreviewArgs args = {
         .ctpv = ctpv.ctpv_path,
-        .f = f, .w = w, .h = h, .x = x, .y = y
+        .f = f, .w = w, .h = h, .x = x, .y = y, .id = id
     };
 
     return run_preview(get_ext(f), mimetype, &args);
diff --git a/preview.c b/preview.c
index a84079b..522fe90 100644
--- a/preview.c
+++ b/preview.c
@@ -163,6 +163,7 @@ int run_preview(const char *ext, const char *mimetype, PreviewArgs *pa)
     SET_PENV("h", pa->h);
     SET_PENV("x", pa->x);
     SET_PENV("y", pa->y);
+    SET_PENV("id", pa->id);
 
     SET_PENV("m", mimetype);
     SET_PENV("e", ext);
diff --git a/preview.h b/preview.h
index 6af9c84..e875c0b 100644
--- a/preview.h
+++ b/preview.h
@@ -10,7 +10,7 @@ typedef struct {
 } Preview;
 
 typedef struct {
-    char *ctpv, *f, *w, *h, *x, *y;
+    char *ctpv, *f, *w, *h, *x, *y, *id;
 } PreviewArgs;
 
 void init_previews(Preview *ps, size_t len);