diff --git a/Sources/SwiftMath/MathBundle/MathFont.swift b/Sources/SwiftMath/MathBundle/MathFont.swift
index 66d4c01..5e6d443 100644
--- a/Sources/SwiftMath/MathBundle/MathFont.swift
+++ b/Sources/SwiftMath/MathBundle/MathFont.swift
@@ -129,6 +129,7 @@ private class BundleManager {
         cgFonts.values.forEach { cgFont in
             CTFontManagerUnregisterGraphicsFont(cgFont, &errorRef)
         }
+        cgFonts.removeAll()
     }
     public enum FontError: Error {
         case invalidFontFile