diff --git a/src/anim.c b/src/anim.c
index fdcac02..408fd62 100644
--- a/src/anim.c
+++ b/src/anim.c
@@ -42,20 +42,18 @@ int hexagram_anim_step(hexagram_anim *anim, hexagram_anim_progress_fn *fn) {
             continue;
         }
 
-        if (interval <= offset + duration) {
+        if (offset + duration >= interval) {
             break;
         }
 
         offset += duration;
     }
 
+    /* Determine progress through current stop */
     if (i == anim->count) {
-        /* We are apparently at the end. */
-        return 0;
-    }
-
-    /* Determine current progress through current stop */
-    if (fn) {
+        i--;
+        progress = 1.0;
+    } else if (fn) {
         progress = fn(&anim->stops[i],
                       (interval - offset) / anim->stops[i].duration);
     } else {