diff --git a/AssFontSubset.Core/src/AssFont.cs b/AssFontSubset.Core/src/AssFont.cs
index 9b22cf6..b6bf296 100644
--- a/AssFontSubset.Core/src/AssFont.cs
+++ b/AssFontSubset.Core/src/AssFont.cs
@@ -22,7 +22,7 @@ public static Dictionary<AssFontInfo, List<Rune>> GetAssFonts(string file, out A
             var undefinedStyles = new HashSet<string>();
             foreach (var und in undefinedStylesTemp)
             {
-                var usedUndStylesEvents = ass.Events.Collection.Where(e => e.Style == und);
+                var usedUndStylesEvents = ass.Events.Collection.Where(e => e.Style == und && e.IsDialogue);
                 var notUsed = true;
                 foreach (var evt in usedUndStylesEvents)
                 {