diff --git a/aegisub/src/dialog_about.cpp b/aegisub/src/dialog_about.cpp
index a4efe1607..ccb8a3628 100644
--- a/aegisub/src/dialog_about.cpp
+++ b/aegisub/src/dialog_about.cpp
@@ -98,6 +98,9 @@ AboutScreen::AboutScreen(wxWindow *parent)
 	libString += "    Freetype - Copyright (c) David Turner, Robert Wilhelm, Werner Lemberg;\n";
 #endif
 	libString += "    MyThes - Copyright (c) Kevin B. Hendricks, Stratford, Ontario, Canada.\n";
+#ifdef WITH_FFTW3
+	libString += "    FFTW - Copyright (c) Matteo Frigo, Massachusetts Institute of Technology;\n"
+#endif
 
 	wxString translatorCredit = _("Translated into LANGUAGE by PERSON\n");
 	if (translatorCredit == "Translated into LANGUAGE by PERSON\n") translatorCredit.Clear();