1 files changed, 12 insertions, 7 deletions

diff --git a/src/xfaces.c b/src/xfaces.c
index fecd8e546cf..84d49e30a9b 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -5579,12 +5579,19 @@ cache_face (c, face, hash)
   face->id = i;
 
   /* Maybe enlarge C->faces_by_id.  */
-  if (i == c->used && c->used == c->size)
+  if (i == c->used)
     {
-      int new_size = 2 * c->size;
-      int sz = new_size * sizeof *c->faces_by_id;
-      c->faces_by_id = (struct face **) xrealloc (c->faces_by_id, sz);
-      c->size = new_size;
+      if (c->used == c->size)
+        {
+          int new_size, sz;
+          new_size = min (2 * c->size, MAX_FACE_ID);
+          if (new_size == c->size)
+            abort ();  /* Alternatives?  ++kfs */
+          sz = new_size * sizeof *c->faces_by_id;
+          c->faces_by_id = (struct face **) xrealloc (c->faces_by_id, sz);
+          c->size = new_size;
+        }
+      c->used++;
     }
 
 #if GLYPH_DEBUG
@@ -5603,8 +5610,6 @@ cache_face (c, face, hash)
 #endif /* GLYPH_DEBUG */
 
   c->faces_by_id[i] = face;
-  if (i == c->used)
-    ++c->used;
 }